Diego Janches

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Diego Janches

  • RESEARCH AST, FIELDS AND PARTICLES
  • 301.286.0597
  • NASA/GSFC
  • Mail Code: 674
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    Dr. Diego Janches joined the NASA/GSFC Space Weather Laboratory in October, 2010. He obtained his Master in Physics in 1993 at the University of Buenos Aires, Argentina. In 1996 he obtained a Master in Astronomy and Astrophysics and a PhD in Electrical Engineering in 2000 both at Penn State University. After obtaining his doctorate and before joining NASA, Dr. Janches was a postdoctoral fellow at the Swedish Institute for Space Physics in Kiruna, Sweden, a NSF/CEDAR Postdoc at the Arecibo Observatory in Puerto Rico, a visiting fellow at Kyoto University in Japan, and a Sr. Research Scientists at NorthWest Research Associates/CoRA office. Dr. Janches’ research expertise focus on resolving major outstanding problems related to the impact of the meteoric flux in the upper atmosphere, with primary emphasis on their role on the aeronomy of the Mesosphere and Lower Thermosphere (MLT) atmospheric region. Specific applications include: The sources and variations (temporal and geographical) of the meteoric flux, and its role in the chemical composition of the MLT; The origin and global distribution of the metallic layers, dynamical transport of metals, and modelling the subsequent formation of meteoric smoke and its seasonal distribution in the MLT; Orbital dust distribution and populations in the solar system; asteroidal and cometary origins; The mechanisms by which metallic atoms are ablated from the meteoroid body and deposited in the MLT; Physical and Electronic risk assessment to satellites due to meteoroid impacts. He has extensive expertise in using radars, specifically Incoherent Scatter Radars and meteor radars to study the impact of meteors on the MLT. He also works on topics related to the impact of Gravity Waves (GWs) in the MLT and has developed, together with Dr. D. Fritts (Gats, Inc) and Prof. W. Hocking (University of Western Ontario) a meteor radar design to measure vertical transfer of horizontal momentum flux in the MLT by GWs. In particular he has deployed two of these radars in Southern Argentina and King George Island, Antarctica. At NASA, Dr. Janches is currently developing a Spaceborne Na Lidar concept to be deployed in the International Space Station in order to study globally small-scale dynamics in the MLT. He has over 50 publications in Peer-Reviewed journals

    Asteroid 24411 Janches is named after him.



    Research Interests

    Radar and Lidar Studies of the Micrometeor Mass Input and its e ects into the Mesosphere/Lower Thermosphere (MLT).


    Orbital dust distribution and populations in the solar system.

     

    Ionospheric and Gravity Wave in the MLT studies using Radars.

     

    Positions/Employment

    10/2010 - Present

    Research Astrophysicist, Fields and Particles

    National Aeronautics and Space Admonistration, Goddard Space Flight Center Carry out scienti c investigations that have special signi cance for the success of NASA's programs. Among
    major duties are included the development of new concepts, methods, or techniques that may have a signi cant impact on science or technology, participate as principle or co-investigator for sounding rocket or small satellite based upper atmospheric research, serve on important committees and review panels of technical groups and professional organizations; isolating and de ning critical conditions and problems within the NASA's research and development program or project; preparing consolidated reports and journal articles of the scienti c and technical research approaches used and results obtained; making formal presentations to other Federal agencies, universities, professional societies, and state and local government organizations; determining the validity and soundness of theories, standards, and guides developed for improving research and technical activities; and resolving critical problems that impact research a ecting multiple stakeholders.

    Research includes, but is not limited to, to resolve major outstanding problems related to the impact of the
    meteoric flux in the upper atmosphere, with primary emphasis on their role on the aeronomy of the Mesosphere and Lower Thermosphere (MLT) atmospheric region. Speci c applications include: The sources and variations (temporal and geographical) of the meteoric flux, and its role in the chemical composition of the MLT; The origin and global distribution of the metallic layers, dynamical transport of metals, and modelling the subsequent formation of meteoric smoke and its seasonal distribution in the MLT; Orbital dust distribution and populations in the solar system; asteroidal and cometary origins; The mechanisms by which metallic atoms are ablated from the meteoroid body and deposited in the MLT; Physical and Electronic risk assessment to satellites due to meteoroid impacts .

    Programmatic duties include:
    1) Project Scientists of the NASA TIMED Satellite which includes responsibility for the management of the overall development and operational efforts for Heliophysics space science program in ITM physics by overseeing the largest NASA Satellite dedicated to ITM studies. Assesses and evaluates the mission program operational activities ensuring the achievement of the scientific requirements established by the Heliophysics Senior Review process. Develops and justifies science budget in coordination with other offices at NASA/GSFC, NASA-Headquartes and participating external academic and research institutions in order to establish cost, schedule of products, deliverables, and services.


    2) Technical Officer for the Magnetosphere-Ionosphere-Thermosphere-Mesosphere Low Cost Access to Space (Mag-ITM/LCAS) and ITM Support Research (SR) programs. Duties include serve as an expert consultant regarding problems in NASA ITM space mission, assisting the Heliophysics Division Director and Program Scientists to define program requirements, prepare and conduct peer-review panels and develop funding recommendations.

    2/2005 - 10/2010

    Sr. Research Associate

    NorthWest Research Associates (NWRA), Boulder, CO USA Participate as principle or co-investigator for scientific investigations in upper atmospheric research and space sciences, serve on internal and external committees and review panels of technical groups and professional organizations; design, prepare and submit proposals to government agencies (i.e. NSF,NASA) ; preparing consolidated reports and journal articles of the scientific and technical research approaches used and results obtained; making formal presentations to other Federal agencies, universities, professional societies, and state and local government organizations;

    Achievements:
    -Leading Project Scientist in the Argentine Ionospheric Radar Experiment Station (AIRES) involving the development of an upper atmospheric facility in La Plata, Argentina by re-deploying the Advance Modular Incoherent Scatter Radar (AMISR) to the Argentine Institute of Radio Astronomy campus near the Arecibo Geomagnetic conjugate point. This effort will result on a Global Scale Ionospheric Plasma Laboratory by placing two NSF upper atmospheric facilities at both end of the same geomagnetic line.

    -Deployment and operation of two high power meteor radars, the first one at Tierra del Fuego in Southern Argentina and the second one at the Brazilian Antarctic Station Comandante Ferraz in King George Island, as part of a large international effort which includes scientists and institutions from Argentina, Brazil, the UK, Canada and the USA.

    -PI and Co-I in NSF, NASA and ONR proposals amounting in more than $3M in five years of research funds

    - More than 40 publications in peer-reviewed journals reporting extensive Research Radar and Lidar Studies of the Micrometeor Mass Input and its effects into the MLT. Orbital dust distribution and populations in the solar system, Ionospheric and Gravity Wave in the MLT studies using Incoherent Scatter and Meteor Radars.

    -Organization and coordination of American Students visits to Argentina to perform research and develop international collaborations. Organization of International Schools and Conferences.

    -Active user of NSF and international radar facilities including the Arecibo 430 MHz radar in Puerto Rico, the 50 MHz Jicamarca radio observatory in Peru, the Poker Flat Incoherent Scatter Radar in Alaska, the
    European Incoherent Scatter Radar (EISCAT) in northern Scandinavia and the MU radar in Japan.

    -Undergraduate and graduate student thesis advisor.

    -Part of an Antarctic project that involves: 1) the maintenance and operation of a meteor radar; and 2) the installation and maintenance of an all-sky Na camera in the Amudsen-Scott station at the South Pole.

    2/2004 - 2/2005

    Research Scientist II

    Cooperative Institute for Research in Environmental Science University of Colorado, Boulder, CO USA Duties:

    Research of meteor studies and upper atmospheric dynamics using Incoherent Scatter and meteor radars. Studies of upper atmospheric neutral dynamics using data from the GUVI instrument on board the NASA TIMED satellite.

    Achievments

    1. PI or Co-I on three proposals submitted to various NSF programs.
    2. Traveled to the Amudsen-Scott station at the South Pole Station to help maintain and upgrade a meteor radar.
    3. Presented results at various international and national scienti c conferences.
    4. Published several research articles in peer-reviewed scienti c journals.

    8/2003 - 2/2004

    Research Associate

    Arecibo Observatory Cornell University, Arecibo, Puerto Rico Research on meteor science and upper atmospheric dynamics. Performed more than 200 hours of observations using the 430 MHz Arecibo Incoherent Scatter Radar. Mentored undergraduate students and helped in coordinating the Research Experience for Undergraduates (REU) summer program.
    8/2001 - 8/2003

    NSF/CEDAR Postdoctoral Fellow

    Penn State University, Arecibo Observatory, Arecibo, Puerto Rico Performed reaserch at the Arecibo Observatory on meteoric mass input in the upper atmosphere. Operate the 430 MHz Arecibo Incoherent scatter radar Mentored undergraduate students participating in the Research Experience for Undergraduates (REU) summer program at the Observatory.

    Achievements

    1. Organized and hosted the Radar Meteor workshop in Spring of 2003 held at the Observatory. This in-
    ternational meeting was attended by more than 50 participants from UK, Canada, USA, Russia and the
    Czech Republic.

    2. Presented results at various international and national conferences (e.g. CEDAR, AGU, Meteoroids, ACM, etc).

    3. Published results in peer-reviewed scienti c journals.
    1/2001 - 8/2001

    Postdoctoral Fellow

    Swedish Institute of Space Physics, Kiruna, Sweden Performed meteor studies using the European Incoherent Scatter Radars system in arctic Scandinavia.

    Achievements

    1. Assisted in the organization of the Meteoroids 2001 conference held in Kiruna, Sweden, August 2001.
    2. Published results in peer-reviewed scienti c journals.
    8/1996 - 12/2000

    Graduate Research Assistant

    Department of Electrical Engineering Penn State University, University Park, PA USA Performed physical and orbital studies of meteors using the Arecibo 430 MHz radar which included developing software to analyze large amount of radar data. Participated in several observing campaigns at Arecibo and Jicamarca Radio Observatory in Peru. Presented results in various national and international conference. Published results on peer-reviewed journals. Participated in various graduate student committees at the department.
    8/1994 - 8/1996

    Graduate Research Assistant

    Department of Astronomy and Astrophysics Penn State University, University Park, PA USA Built a Thermal Vacuum system to test X-ray CCD cameras for payloads on board satellites and rockets. Participated in the environmental tests of the Argentine sattelite SAC-B at the Instituto Nacional de Pesquisas Espaciais. San Jose Dos Campos, Brazil. Participated in campaigns at the University of Wisconsin Synchrotron Radiation Center multilayer beam - line to measure transmission of lters for an X-Ray CCD imaging spectrometer, the main instrument on the Advance X-Ray Astrophysics Facility (aka CHANDRA) satellite. Used CCD camera to perform experiments at University of Wisconsin Synchrotron Radiation Center on two occasions.
    8/1993 - 8/1994

    Research Assistant

    Department of Astronomy and Astrophysics Penn State University, University Park, PA USA  
    1990 - 1993

    Undergraduate Teaching Assistant

    Department of Physics University of Buenos Aires, Buenos Aires, Argentina  
    1989 - 1991

    Undergraduate Research Assistant

    Department of Medical Physics Hospital Oncologico Angel H. Roffo, Buenos Aires, Argentina  

    Professional Societies

    Division of Planetary Science of the American Astronomical Society, 2010 - Present
    International Astronomical Union, 2012 - Present
    Member of Commission 22
    American Geophysical Union, 2000 - Present
    International Union of Radio Science, 2000 - Present
    Commission G

    Professional Service

    -Member of Scientific Organizing Committee of the Applied Space Environments Conference, Huntsville, AL, May 15-19th, 2017

    -Member of the NASA Engineering Safety Center (NESC) Space Environment Technical Discipline Team, 2016 - Present

    -Vice President of IAU Commission F.1 Meteors, Meteorites and Interplanetary Dust, 2015-2018

    -Asocciate Editor JGR-Atmosphere September 2014 - December 2017

    - Local Organizing Committee, Meteoroids 2001, 6-10 August 2001, Swedish Institute of Space Physics, Kiruna, Sweden.

    - Convener for Meteors: Physics, Chemistry and Techniques, Workshop at CEDAR Meeting, Longmont, CO, June 16-25, 2002.

    - Local and Technical Organizing Committee, Radar Meteor Workshop, Arecibo Observatory, Arecibo, Puerto Rico, March 2003.
    
    -Guest editor for the Special Issue in Atmospheric Chemistry and Physics of Radar Meteor Workshop (Prof. John M.C. Plane, Co-Editor), October, 2003.
    
    -Convener for AGU session Meteors and the Mesopause, J.S. Friedman co-chair, AGU Fall meeting, San Francisco, CA, USA, December 8-12, 2003.
    
    -Guest Editor for Meteors and the Mesopause in J. Atmos. Solar Terr. Phys., J.S. Friedman co-editor, 2004.

    - Convener for Meteors in the upper atmosphere Workshop at CEDAR Meeting, L. Dyrud co-convener,
    Santa Fe, NM, 2004, 2005 and 2006.
    
    -Convener for Impacts of Meteor in the Atmosphere Session at EGU, Prof. John Plane co-convener, Vienna, Austria, April 2005
    
    -Advisor of the Research Experience for Undergraduates (REU) Summer program at Arecibo Observatory, Summer 2005.
    
    -Local and Technical Organizing Committee, A concept development for an Upper atmospheric research facility at the Arecibo Conjugate point in Argentina Workshop, Arecibo Observatory, Arecibo, Puerto Rico, April 2006.
    
    -Convener for Aeronomy Research Opportunities in South America Workshop at CEDAR Meeting, C. Martinis co-convener, Santa Fe, NM, June 2006.
    
    -Convener for Meteors Session at the 36th COSPAR Scienti c Assembly, S. Palo co-convener, Beijing, China, 16-23 July, 2006
    
    -Guest editor for Advances in Space Research, 2006 

    - Scienti c organizing committee for Meteorids 2007, Barcelona, Spain, June 2007.
    
    -Member of the CEDAR Scienti c Steering Committee, June 2006 { June 2009
    
    -Guest editor for Meteoroids 2007 special issue on Earth. Moon and Planets, 2007.
    
    -Chair of the Scienti c and Local Organizing Committees of Meteoroids 2010 held in Breckenridge, CO, May 2010.

    - Organization of the Panamerican Advance Science Institute (PASI): Chemistry and Dynamics of the Upper Atmosphere, San Juan, Argentina, October 2010.
    
    -Editorial board of Journal of Atmospheric and Solar Terrestrial Physics, 2007-Present
    
    -Committee of Visitors, NSF- Upper Atmospheric Research Section, July 2008.
    
    -Journal Reviewer for Meteoritics, Geophys. Ress. Lett., IEEE Transaction on Remote Sensing and Geoscience, Astronomy and Astrophysics, Annales Geophysicae, JGR (Atmosphere and Space Physics), Icarus.

    - Proposal reviewer for NSF-ATM, U.S. Civilian Research and Development Foundation (CRDF),
    US Department of State for the Science Centers (ISTC - International Science & Technology Center in Moscow).

    Awards

    1. Asteroid 2000AU240 renamed 24411Janches by the IAU Minor Planet Center - July 2014
    2. U.S. Department of Defense Antarctic Service Medal - March 2011
    3. Short Term Visit Fellowship, Japanese Sciety for the Promotion of Science - February 2009
    4. CEDAR/NSF Postdoctoral Fellowship, October 2000
    5. A.J. Ferraro Graduate Research Award, April 2000

    Grants

    08/31/2016 - 08/30/2019 A radar and optical survey of meteor showers with southern ecliptic radiants, NASA Planetary Science Division - Solar System Observations
    PI
    03/31/2015 - 03/30/2018 Experimental Investigation of micrometeoroid ablation, NASA - Heliophysics Science Division
    Co-I
    04/01/2013 - 03/31/2016 METEORIC PLASMA LAYERS ON VENUS AND MARS, NASA, NASA NRA #: Planetary Atmosphere
      ; Co-I, with PI: P. Withers (Boston U.)
    Grant Amount: $$159,005
    04/01/2013 - 03/31/2016 Orbital Studies of the Zodiacal Dust Cloud utilizing radar observations and models, NASA, NASA NRA #: Planetary Astronomy
      ; PI
    Grant Amount: $$283,775
    09/15/2009 - 09/14/2011 PASI on Dynamics and Chemistry of the Mesosphere and Thermosphere: Promoting Inter-American Collaborations, NSF
      ; Co-I, with PI: R. Garcia (NCAR)
    Grant Amount: $$97,000
    08/15/2009 - 07/31/2013 Large and Small-scale Dynamics and Meteor Studies in the MLT with a New-generation Meteor Radar on King George Island, NSF-OPP
      ; Co-I; with PI: D. Fritts (NWRA)
    Grant Amount: $$750,000
    09/01/2009 - 08/31/2012 Scienti c, educational and logistical preparation for AMISR relocation to Argentina , NSF-UAF
      ; PI
    Grant Amount: $$400,000
    09/01/2009 - 08/31/2013 Orbital Studies of Interplanetary and Interstellar dust upgrading a sophisticated meteor radar, NSF-Astronomy&Astrophysics
      ; PI
    Grant Amount: $$400,000
    08/01/2008 - 07/31/2011 International:Student Participation in a Unique Meteor Radar for Atmospheric Studies in Argentina, NSF-OISE
      ; PI
    Grant Amount: $$110,128
    07/01/2006 - 06/30/2009 CEDAR: An Observational and Theoretical Study of the Climatology of the Ca/Ca+ Layer in the MLT at Arecibo and its Relation to the Sporadic Micrometeor Flux, NSF-CEDAR
      ; Co-I; with PI: S. Raizada (Arecibo Observatory)
    06/01/2007 - 05/31/2011 Dynamics and Meteor Studies Using a Novel Radar at a Critical Southern Latitude, NSF-Aeronomy
      ; PI, with Co-I: D. Fritts (NWRA)
    Grant Amount: $$629,999
    07/01/2006 - 06/30/2006 Collaborative studies of the Antarctic Mesosphere and Lower Thermosphere, NSF-OPP
      ; Co-I; with PI: S. Palo (University of Colorado)
    03/01/2005 - 02/28/2007 Momentum Flux Studies of the MLT Using the 430 MHz Dual Beam Arecibo Observatory, Cornell University
      ; PI
    Grant Amount: $$87,399
    09/01/2005 - 08/31/2010 Collaborative Research: High-time-resolution resonance lidar detection of meteor trails, NSF-Aeronomy
      ; PI, with Co-I: J. Friedman (Arecibo Obs.)
    Grant Amount: $$455,713
    08/01/2008 - 07/31/2009 Micrometeors and Their Interaction with the Atmosphere: A Comprehensive Study Using the Arecibo and Jicamarca Observatories, NSF-Aeronomy
      ; PI
    Grant Amount: $$462,099
    10/01/2010 - 09/30/2003 CEDAR Postdoc Proposal by Diego Janches: An Arecibo/EISCAT observational investigation of the e ects of the meteor mass flux on the 80-120 km atmosphere/ionosphere, NSF-CEDAR
      ; Postdoc
    Grant Amount: $$100,000
    10/01/2016 - 09/30/2019 Lunar Data Analysis Program, NASA, NASA NRA #: NNH15ZDA001N-LDAP

    Constraining Na and K in the lunar exosphere and surface with LADEE data and models

    12/09/2016 heliophysics Instrument and Technology Development for Science, NASA, NASA NRA #: NNH16ZDA001N-HTIDS

    Development of a Sodium Lidar for Spaceborne Missions

    ; Principal Investigator
    10/01/2016 - 09/30/2019 Heliophysics Guest Investigator, NASA

    Study of IR emissions of CO2 and OH in the mesosphere and lower thermosphere using SABER/TIMED observations

    ; Co-Investigaror

    Selected Publications

    Refereed

    Janches, D., P. Pokorný, M. Sarantos, et al. J. R. Szalay, M. Horányi, and D. Nesvorný. 2018. "Constraining the ratio of micrometeoroids from Short and Long Period Comets at 1 AU from LADEE observations of the Lunar Dust Cloud." Geophysical Research Letters, [10.1002/2017gl076065]

    Jenniskens, P., J. Baggaley, I. Crumpton, et al. P. Aldous, P. Pokorny, D. Janches, P. S. Gural, D. Samuels, J. Albers, A. Howell, C. Johannink, M. Breukers, M. Odeh, N. Moskovitz, J. Collison, and S. Ganju. 2018. "A survey of southern hemisphere meteor showers." Planetary and Space Science, [10.1016/j.pss.2018.02.013]

    Liu, G., S. L. England, R. J. Lillis, et al. P. Withers, P. R. Mahaffy, D. E. Rowland, M. Elrod, M. Benna, D. M. Kass, D. Janches, and B. Jakosky. 2018. "Thermospheric Expansion Associated With Dust Increase in the Lower Atmosphere on Mars Observed by MAVEN/NGIMS." Geophysical Research Letters, 45 (7): 2901-2910 [10.1002/2018gl077525]

    Panka, P. A., A. A. Kutepov, L. Rezac, et al. K. S. Kalogerakis, A. G. Feofilov, D. Marsh, D. Janches, and E. Yiğit. 2018. "Atomic oxygen retrieved from the SABER 2.0 and 1.6 μm radiances using new first-principles nighttime OH(v) model." Geophysical Research Letters, (In Press) [10.1029/2018gl077677]

    De Wit, R., D. Janches, D. C. Fritts, R. G. Stockwell, and L. Coy. 2017. "Unexpected Climatological Behavior of MLT Gravity Wave Momentum Flux in the Lee of the Southern Andes Hotspot." Geophysical Research Letters, [10.1002/2016GL072311]

    McCormack, J., K. Hoppel, D. Kuhl, et al. R. de Wit, G. Stober, P. Espy, N. Baker, P. Brown, D. Fritts, C. Jacobi, D. Janches, N. Mitchell, B. Ruston, S. Swadley, K. Viner, T. Whitcomb, and R. Hibbins. 2017. "Comparison of mesospheric winds from a high-altitude meteorological analysis system and meteor radar observations during the boreal winters of 2009–2010 and 2012–2013." Journal of Atmospheric and Solar-Terrestrial Physics, 154: 132-166 [10.1016/j.jastp.2016.12.007]

    Thomas, E., J. Simolka, M. DeLuca, et al. M. Horányi, D. Janches, R. A. Marshall, T. Munsat, J. M. Plane, and Z. Sternovsky. 2017. "Experimental setup for the laboratory investigation of micrometeoroid ablation using a dust accelerator." Review of Scientific Instruments, 88 (3): 034501 [10.1063/1.4977832]

    Pokorny, P., D. Janches, P. Brown, and J. Hormaechea. 2017. "An Orbital Meteoroid Stream Survey using the Southern Argentina Agile MEteor Radar (SAAMER) based on a Wavelet approach." Icarus, (290): 162-182 [10.1016/j.icarus.2017.02.025]

    Swarnalingam, N., W. Hocking, D. Janches, and J. Drummond. 2017. "Observation of Polar Mesosphere Summer Echoes Using the Northernmost MST Radar at Eureka (80N)." Journal of Atmospheric and Solar Terrestrial Physics, [10.1016/j.jastp.2017.03.015]

    Schult, C., G. Stober, D. Janches, and J. L. Chau. 2017. "Results of the first continuous meteor head echo survey at polar latitudes." Icarus, 1-13 [10.1016/j.icarus.2017.06.019]

    Pokorný, P., M. Sarantos, and D. Janches. 2017. "Reconciling the Dawn–Dusk Asymmetry in Mercury’s Exosphere with the Micrometeoroid Impact Directionality." The Astrophysical Journal Letters, 842 (2): L17 [10.3847/2041-8213/aa775d]

    Janches, D., N. Swarnalingam, J. D. Carrillo-Sanchez, et al. J. C. Gomez-Martin, R. Marshall, D. Nesvorný, J. M. Plane, W. Feng, and P. Pokorný. 2017. "Radar Detectability Studies of Slow and Small Zodiacal Dust Cloud Particles. III. The Role of Sodium and the Head Echo Size on the Probability of Detection." The Astrophysical Journal, 843 (1): 1 [10.3847/1538-4357/aa775c]

    Federico Conte, J., J. L. Chau, G. Stober, et al. N. Pedatella, A. Maute, P. Hoffmann, D. Janches, D. Fritts, and D. J. Murphy. 2017. "Climatology of semidiurnal lunar and solar tides at mid and high latitudes: interhemispheric comparison." Journal of Geophysical Research: Space Physics, [10.1002/2017ja024396]

    Abedin, A., P. Wiegert, D. Janches, et al. P. Pokorný, P. Brown, and J. L. Hormaechea. 2017. "Formation and past evolution of the showers of 96P/Machholz complex." Icarus, [10.1016/j.icarus.2017.07.015]

    de Wit, R. J., D. Janches, D. C. Fritts, and R. E. Hibbins. 2016. "QBO modulation of the mesopause gravity wave momentum flux over Tierra del Fuego." Geophysical Research Letters, [10.1002/2016gl068599]

    Plane, J. M., J. C. Gómez-Martín, W. Feng, and D. Janches. 2016. "Silicon chemistry in the mesosphere and lower thermosphere." J. Geophys. Res. Atmos., 78 (4): 734-745 [10.1002/2015jd024691]

    Thomas, E., M. Horányi, D. Janches, et al. T. Munsat, J. Simolka, and Z. Sternovsky. 2016. "Measurements of the ionization coefficient of simulated iron micrometeoroids." Geophysical Research Letters, 43 (8): 3645-3652 [10.1002/2016gl068854]

    Dawkins, E., J. M. Plane, M. P. Chipperfield, et al. W. Feng, D. R. Marsh, J. Hoeffner, and D. Janches. 2016. "Solar cycle response and long-term trends in the mesospheric metal layers." JGR- Space Physics, [10.1002/2016JA022522]

    Panka, P. A., A. A. Kutepov, K. S. Kalogerakis, et al. D. Janches, J. M. Russell, L. Rezac, A. G. Feofilov, M. G. Mlynczak, and E. Yiğit. 2016. "Resolving the mesospheric nighttime 4.3 μm emission puzzle: New model calculations improve agreement with SABER observations." Atmospheric Chemistry and Physics Discussions, 1-13 [10.5194/acp-2016-766]

    Carrillo-Sánchez, J. D., D. Nesvorný, P. Pokorný, D. Janches, and J. M. Plane. 2016. "Sources of Cosmic Dust in the Earth's Atmosphere." Geophysical Research Letters, [10.1002/2016gl071697]

    Michell, R. G., D. Janches, M. Samara, et al. J. Hormaechea, C. Brunini, I. Bibbo, and D. C. Fritts. 2015. "Optical observations of meteor head echoes observed with the SAAMER radar ." Planetary and Space Science, (In Press) [doi:10.1016/j.pss.2015.04.018]

    Brunini, C., F. Azpilicueta, and D. Janches. 2015. "An Attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI." Advances in Space Research, 55 (8): 2033–2040 [doi:10.1016/j.asr.2014.07.023]

    Janches, D., N. Swarnalingam, J. M. Plane, et al. D. Nesvorny, W. Feng, D. Vokrouhlický, and M. J. Nicolls. 2015. "Radar detectability studies of slow and small Zodiacal Dust Cloud Particles: II. A study of three radars with different sensitivity." Astrophysical Journal, 807 (13): [10.1088/0004-637X/807/1/13]

    Janches, D., S. Close, J. Hormaechea, et al. N. Swarnalingam, A. Murphy, D. O'Connor, B. Vandepeer, B. Fuller, D. C. Fritts, and C. Brunini. 2015. "The Southern Argentina Agile MEteor Radar Orbital System (SAAMER-OS): An Initial Sporadic Meteoroid Orbital Survey in the Southern Sky." Astrophysical Journal, 809 [10.1088/0004-637X/809/1/36]

    Carrillo-Sanchez, J. D., J. M. Plane, W. Feng, D. Nesvorny, and D. Janches. 2015. "On the size and velocity distribution of cosmic dust particles entering the 1 atmosphere." Geophys. Res. Lett, (42): 6518–6525 [10.1002/2015GL065149]

    Imura, H., D. C. Fritts, D. Janches, and W. Singer. 2015. "Interhemispheric comparison of the 5-day wave planetary wave from meteor radar wind measurements." Annales Geophysicae, (33): 1349-1359 [10.5194/angeo-33-1349-2015]

    Michell, R., D. Janches, M. Samara, et al. J. Hormaechea, C. Brunini, and I. Bibbo. 2015. "Simultaneous optical and radar observations of meteor head-echoes utilizing SAAMER." Planetary and Space Science, 118: 95-101 [10.1016/j.pss.2015.04.018]

    Janches, D., W. Hocking, S. Pifko, et al. J. L. Hormaechea, D. C. Fritts, C. Brunini, R. Michell, and M. Samara. 2014. "Interferometric meteor head echo observations using the Southern Argentina Agile Meteor Radar." Journal of Geophysical Research - Space Physics, 119: [10.1002/2013JA019241]

    Langowski, M., C. von Sacigny, J. Burrows, et al. W. Feng, J. M. Plane, D. R. Marsh, D. Janches, M. Sinnhuber, and A. C. Aikin. 2014. "Global investigation of the Mg atom and ion layers using SCIAMACHY/Envisat observations between 70 km and 150 km altitude and WACCM-Mg model results." Atmospheric Chemistry & Physics Discussions, 14: 1971-2019 [10.5194/acpd-14-1971-2014]

    Krainak, M. A., A. W. Yu, D. Janches, et al. S. L. Jones, B. Blagojevic, and J. R. Chen. 2014. "Self-Raman Nd:YVO4 laser and electro-optic technology for space-based sodium lidar instrument." Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices, 8959: [10.1117/12.2041453]

    Plane, J. M., W. Feng, E. Dawkins, et al. M. P. Chipperfield, J. Hoffner, D. Janches, D. R. Marsh, and E. Dawkins. 2014. "Resolving the strange behaviour of extra-terrestrial potassium in the upper atmosphere." Geophysical Research Letters, 41: [10.1002/2014GL060334]

    Robertson, S., S. Dickson, M. Horanyi, et al. Z. Stenovsky, M. Friedrich, D. Janches, L. Megner, and B. Williams. 2014. "Detection of meteoric smoke particles in the mesosphere by a rocket-borne mass spectrometer." Journal of Atmospheric and Solar-Terrestrial Physics, 118: 161-179.

    Janches, D., J. M. Plane, D. Nesvorny, et al. W. Feng, D. Vokoruhlicky, and M. J. Nicolls. 2014. "Radar detectability studies of slow and small Zodiacal Dust Cloud Particles: 1. The case of the Arecibo 430 MHz meteor head echo observations." Astrophysical Journal, 796 (41): [10.1088/0004-637X/796/1/41]

    Pifko, S., D. Janches, S. Close, et al. J. J. Sparks, T. Nakamura, and D. Nesvorny. 2013. "The Meteoroid Input Function and predictions of mid-latitude meteor observations by the MU radar." Icarus, 223: 444-459 [10.1016/j.icarus.2012.12.014]

    Janches, D., J. L. Hormaechea, C. Brunini, W. Hocking, and D. C. Fritts. 2013. "An initial meteoroid stream survey in the southern hemisphere using the Southern Argentina Agile Meteor Radar (SAAMER)." Icarus, 223: 677-683 [10.1016/j.icarus.2012.12.018]

    Feng, W., D. R. Marsh, M. P. Chipperfield, et al. D. Janches, J. Hoffner, F. Yi, and J. M. Plane. 2013. "A global atmospheric model of meteoric iron." Journal of Geophysical Research - Atmospheres, 118: 9456–9474 [10.1002/jgrd.50708]

    Marsh, D. R., D. Janches, W. Feng, and J. M. Plane. 2013. "A global model of meteoric sodium." Journal of Geophysical Research - Atmospheres, 118: 11,442–11,452 [10.1002/jgrd.50870]

    Andrioli, V. F., D. C. Fritts, P. P. Batista, B. R. Clemesha, and D. Janches. 2013. "Diurnal variation in gravity wave activity at low and middle latitudes." Annales Geophysicae, 31: 2123-2135 [10.5194/angeo-31-2123-2013]

    Fritts, D. C., D. Janches, H. Himura, et al. W. K. Hocking, J. V. Bageston, and N. M. Leme. 2012. "Drake Antarctic Agile Meteor Radar first results: Configuration and comparison of mean and tidal wind and gravity wave momentum flux measurements with Southern Argentina Agile Meteor Radar." Journal of Geophysical Research - Atmospheres, 117: D02105 [10.1029/2011JD016651]

    Fritts, D. C., H. Imura, R. Lieberman, D. Janches, and W. Singer. 2012. "A conjugate study of mean winds and planetary waves employing enhanced meteor radars at Rio Grande, Argentina (53.8°S) and Juliusruh, Germany (54.6°N)." Journal of Geophysical Research - Atmospheres, 117: D05117 [10.1029/2011JD016305]

    Fritts, D. C., D. Janches, W. K. Hocking, N. J. Mitchell, and M. J. Taylor. 2012. "Assessment of gravity wave momentum flux measurement capabilities by meteor radars having different transmitter power and antenna configurations." Journal of Geophysical Research - Atmospheres, 117: D10108, [10.1029/2011JD017174]

    Nicholls, M. J., D. C. Fritts, D. Janches, and C. Heinselman. 2012. "Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar." Annales Geophysicae, 30: 945-962 [10.5194/angeo-30-945-2012]

    Gardner, C. S., X. Chu, P. Espy, et al. J. M. Plane, D. R. Marsh, and D. Janches. 2011. "Seasonal variations of the mesospheric Fe layer at Rothera, Antarctica (67.5°S, 68.0°W)." Journal of Geophysical Research - Atmospheres, 116: D02304 [10.1029/2010JD014655]

    Cooke, W. J., D. E. Moser, B. F. Hardin, and D. Janches. 2011. "Meteoroids: The Smallest Solar System Bodies." NASA/CP—2011–216469,

    Nesvorny, D., D. Vokrouhlicky, P. Pokorny, and D. Janches. 2011. "Dynamics of Dust Particles Released from Oort Cloud Comets and Their Contribution to Radar Meteors." The Astrophysical Journal, 743 (1): 37 [10.1088/0004-637X/743/1/37]

    Nesvorny, D., D. Janches, D. Vokrouhlicky, et al. P. Pokorny, W. F. Bottke, and P. Jenniskens. 2011. "Dynamical Model for the Zodiacal Cloud and Sporadic Meteors." The Astrophysical Journal, 743 (2): 129 [10.1088/0004-637X/743/2/129]

    Sparks, J. J., D. Janches, M. J. Nicolls, and C. Heinselman. 2010. "Determination of physical and radiant meteor properties using PFISR interferometry measurements of head echoes." Journal of Atmospheric and Solar Terrestrial Physics, 72: 1221-1230.

    Fritts, D. C., D. Janches, H. Imura, et al. W. K. Hocking, N. J. Mitchell, R. G. Stockwell, B. Fuller, B. Vandepeer, J. Hormaechea, C. Brunini, and H. Levato. 2010. "Southern Argentina Agile Meteor Radar: System design and initial measurements of large‐scale winds and tides." Journal of Geophysical Research - Atmospheres, 115 (D18112): [10.1029/2010JD013850]

    Fritts, D. C., D. Janches, and W. K. Hocking. 2010. "Southern Argentina Agile Meteor Radar: Initial assessment of gravity wave momentum fluxes." Journal of Atmospheric Research - Atmospheres, 115: D19123 [10.1029/2010JD013891]

    Janches, D., and L. P. Dyrud. 2009. "First observation of micrometeoroid differential ablation in the atmosphere." Geophysical Research Letters, 36: L06101 [10.1029/2009GL037389]

    Sparks, J. J., and D. Janches. 2009. "Latitudinal dependence of the variability of the micrometeor altitude distribution." Geophysical Research Letters, 36: L12105 [10.1029/2009GL038485]

    Fentzke, J. T., D. Janches, I. Strelnikova, and M. Rapp. 2009. "Meteoric smoke particle properties derived using dual-beam Arecibo UHF observations of D-region spectra during different seasons." Journal of Atmospheric and Solar Terrestrial Physics, 71: 1982-1991.

    Sparks, J. J., and D. Janches. 2009. "Correction to ‘‘Latitudinal dependence of the variability of the micrometeor altitude distribution’’." Geophysical Research Letters, 36: L17101 [10.1029/2009GL039987]

    Fritts, D. C., and D. Janches. 2008. "Dual-beam measurements of gravity waves over Arecibo: Re-evualation of wave structure, dynamics and momentum fluxes." Journal of Geophysical Research - Atmospheres, 113: D05112 [10.1029/2007JD008896]

    Fentzke, J. T., and D. Janches. 2008. "A semi-empirical model of the contribution from sporadic meteoroid sources on the meteor input function in the MLT observed at Arecibo." Journal of Geophysical Research - Space Physics, 113: A03304 [10.1029/2007JA012531]

    Dyrud, L. P., and D. Janches. 2008. "Modeling the meteor head-echo using Arecibo radar observations." Journal of Atmospheric and Solar-Terrestrial Physics, 70: 1621-1632 [10.1016/j.jastp.2008.06.016]

    Fentzke, J. T., D. Janches, and J. J. Sparks. 2008. "Latitudinal and seasonal variability of the micrometeor input function: A study using model predictions and observations from Arecibo and PFISR." Journal of Atmospheric and Solar-Terrestrial Physics, 71: 653-661 [10.1016/j.jastp.2008.07.015]

    Sparks, J. J., D. Janches, M. J. Nicolls, and C. J. Heinselman. 2008. "Seasonal and diurnal variability of the meteor flux at high latitude observed using PFISR." Journal of Atmospheric and Solar-Terrestrial Physics, 71: 688-696 [10.1016/j.jastp.2008.08.009]

    Janches, D., D. C. Fritts, M. J. Nicolls, and C. J. Heinselamn. 2008. "Observations of D-region Structure and Atmospheric Tides with PFISR during Active Aurora." Journal of Atmospheric and Solar-Terrestrial Physics, 71: 688-696.

    Vondrak, T., J. M. Plane, S. Broadley, and D. Janches. 2008. "A chemical model of meteoric ablation." Atmospheric Chemistry and Physics, 8: 7015-7031.

    Janches, D., and M. J. Nicolls. 2007. "Diurnal variability of the gyro resonance line observed with the Arecibo incoherent scatter radar at E- and F1 -region altitudes." Geophysical Research Letters, 34: L01103 [10.1029/2006GL028510]

    Janches, D., S. Close, and J. T. Fentzke. 2007. "A comparison of detection sensitivity between ALTAIR and Arecibo meteor observations: Can High Power and Large Aperture radars detect low velocity meteor head-echoes,." Icarus, 193: 105-111 [10.1016/j.icarus.2007.08.022]

    Lau, E. M., S. K. Avery, J. P. Avery, et al. D. Janches, S. E. Palo, R. Schafer, and N. A. Makarov. 2006. "Statistical characterization of the meteor distribution at the South Pole using VHF interferometric meteor radar." Radio Science, 41: RS4007 [10.1029/2005RS003247,]

    Janches, D., C. J. Heinselman, J. L. Chau, A. Chandran, and R. Woodman. 2006. "Modeling the global micrometeor input function in the upper atmosphere observed by high power and large aperture radars." Journal of Geophysical Research - Space Physics, 111: A07317 [10.1029/2006JA011628]

    Fritts, D. C., D. Janches, D. M. Riggin, et al. R. G. Stockwell, M. P. Sulzer, and S. Gonzalez. 2006. "Gravity waves and momentum fluxes in the mesosphere and lower thermosphere using 430 MHz dual-beam measurements at Arecibo: 2. Frequency spectra, momentum fluxes, and variability." Journal of Geophysical Research - Atmospheres, 111 (D18108): [10.1029/2005JD006883]

    Janches, D., D. C. Fritts, D. M. Riggin, M. P. Sulzer, and S. Gonzalez. 2006. "Gravity waves and momentum fluxes in the mesosphere and lower thermosphere using 430 MHz dual-beam measurements at Arecibo: 1. Measurements, methods, and gravity waves." Journal of Geophysical Research - Atmospheres, 111: D18107 [10.1029/2005JD006882]

    Janches, D., and J. L. Chau. 2005. "Observed diurnal and seasonal behavior of the micrometeor flux using the Arecibo and Jicamarca radars." Journal of Atmospheric and Solar-Terrestrial Physics, 67: 1196-1210 [10.1016/j.jastp.2005.06.011]

    Wen, C.-H., J. F. Doherty, J. D. Mathews, and D. Janches. 2005. "Meteor detection and non-periodic bursty interference removal for Arecibo data." Journal of Atmospheric and Solar-Terrestrial Physics, 67 (3): 275-281 [10.1016/j.jastp.2004.10.004]

    Dyrud, L. P., K. Denney, J. Urbina, et al. D. Janches, E. Kudeki, and S. Franke. 2005. "The meteor flux: It depends how you look." Earth, Moon, and Planets , 95: 89-100 [10.1007/s11038-005-9001-6]

    de la Pena, S., S. K. Aery, J. P. Avery, E. Lau, and D. Janches. 2005. "Wind measurements of MLT region using the Platteville, CO MEDAC 50MHz meteor radar." Journal of Atmospheric and Solar-Terrestrial Physics, 67: 1211-1215 [10.1016/j.jastp.2005.06.009]

    Friedman, J. S., and D. Janches. 2005. "Special issue on meteors and the mesopause." Journal of Atmospheric and Solar-Terrestrial Physics, 67: 1157-1158 [10.1016/j.jastp.2005.06.001]

    Janches, D., and D. O. ReVelle. 2005. "The Initial Altitude of the Micrometeor Phenomenon: Comparison between Arecibo radar observations and theory." Journal of Geophysical Research, 110: A08307 [10.1029/2005JA011022]

    Raizada, S., C. A. Tepley, D. Janches, et al. J. S. Friedman, Q. H. Zhou, and J. D. Mathews. 2004. "Lidar observations of Ca and K metallic layers from Arecibo and comparison with micrometeor sporadic activity." Journal of Atmospheric and Solar-Terrestrial Physics, 66 (6-9): 595-606 [10.1016/j.jastp.2004.01.030]

    Janches, D., M. C. Nolan, and M. P. Sulzer. 2004. "Radiant measurement accuracy of micrometeors detected by the Arecibo 430 MHz Dual-Beam Radar." Atmospheric Chemistry and Physics, 4: 621-626 [1680-7324/acp/2004-4-621]

    Zhou, Q. H., Y. T. Morton, J. D. Mathews, and D. Janches. 2004. "Aspect sensitivity of VHF echoes from field aligned irregularities in meteor trails and thin ionization layers." Atmospheric Chemistry and Physics, 4: 685-692 [1680-7324/acp/2004-4-685]

    Janches, D., S. E. Palo, E. M. Lau, et al. S. K. Avery, J. P. Avery, S. de la Pena, and N. A. Makarov. 2004. "Diurnal and seasonal variability of the meteor flux at the South Pole measured with radars." GEOPHYSICAL RESEARCH LETTERS, 31: L20807 [10.1029/2004GL021104]

    Janches, D., M. C. Nolan, D. D. Meisel, et al. J. D. Mathews, Q. H. Zhou, and D. E. Moser. 2003. "On the geocentric micrometeor velocity distribution." Journal of Geophysical Research - Space Physics, 108 (A6): 1222 [10.1029/2002JA009789]

    Mathews, J. D., J. D. Doherty, C.-H. Wen, et al. S. J. Briczinski, D. Janches, and D. D. Meisel. 2003. "An update on the UHF radar meteor observation at Arecibo Observatory." Journal of Atmospheric and Solar-Terrestrial Physics, 65: 1139– 1149 [10.1016/j.jastp.2003.07.009]

    Meisel, D. D., D. Janches, and J. D. Mathews. 2002. "Extrasolar Micrometeors Radiating from the Vicinity of the Local Interstellar Bubble." Astrophysical Journal, 567: 323-341.

    Meisel, D. D., D. Janches, and J. D. Mathews. 2002. "The Size Distribution of the Arecibo Interstellar Particles and its Implications." Astrophysical Journal, 579: 895–904.

    Janches, D., A. Pellinen-Wannberg, G. Wanberg, et al. A. Westman, I. Haggstrom, and D. D. Meisel. 2002. "Tristatic Observations of Meteors Using the 930 MHz EISCAT radar." Journal of Geophysical Research - Space Physics, 107 (A11): 1389 [:10.1029/2001JA009205]

    Janches, D., D. D. Meisel, and J. D. Mathews. 2001. "Orbital Properties of the Arecibo Micrometeors at Earth Intersection." Icarus, 150: 205-218 [10.1006/icar.2000.6575]

    Mathews, J. D., D. Janches, D. D. Meisel, and Q. Q. Zhou. 2001. "The Micrometeoroid Mass Flux into the Upper Atmosphere: Arecibo Results and a Comparison with Prior Estimates." Geophysical Research Letters, 28 (10): 1929-193.

    Janches, D., J. D. Mathews, D. D. Meisel, V. S. Getman, and Q. H. Zhou. 2000. "Doppler Studies of Near-Antapex UHF Radar Micrometeors." Icarus, 143: 347-353 [0.1006/icar.1999.6257]

    Janches, D., J. D. Mathews, D. D. Meisel, and Q. H. Zhou. 2000. "Micrometeor Observation using the Arecibo 430 MHz Radar: I. Determination of the Ballistic Parameter from measured Doppler Velocity and Deceleration Results,." Icarus, 145: 53-63.

    Brief Bio

    Dr. Diego Janches joined the NASA/GSFC Space Weather Laboratory in October, 2010. He obtained his Master in Physics in 1993 at the University of Buenos Aires, Argentina. In 1996 he obtained a Master in Astronomy and Astrophysics and a PhD in Electrical Engineering in 2000 both at Penn State University. After obtaining his doctorate and before joining NASA, Dr. Janches was a postdoctoral fellow at the Swedish Institute for Space Physics in Kiruna, Sweden, a NSF/CEDAR Postdoc at the Arecibo Observatory in Puerto Rico, a visiting fellow at Kyoto University in Japan, and a Sr. Research Scientists at NorthWest Research Associates/CoRA office. Dr. Janches’ research expertise focus on resolving major outstanding problems related to the impact of the meteoric flux in the upper atmosphere, with primary emphasis on their role on the aeronomy of the Mesosphere and Lower Thermosphere (MLT) atmospheric region. Specific applications include: The sources and variations (temporal and geographical) of the meteoric flux, and its role in the chemical composition of the MLT; The origin and global distribution of the metallic layers, dynamical transport of metals, and modelling the subsequent formation of meteoric smoke and its seasonal distribution in the MLT; Orbital dust distribution and populations in the solar system; asteroidal and cometary origins; The mechanisms by which metallic atoms are ablated from the meteoroid body and deposited in the MLT; Physical and Electronic risk assessment to satellites due to meteoroid impacts. He has extensive expertise in using radars, specifically Incoherent Scatter Radars and meteor radars to study the impact of meteors on the MLT. He also works on topics related to the impact of Gravity Waves (GWs) in the MLT and has developed, together with Dr. D. Fritts (Gats, Inc) and Prof. W. Hocking (University of Western Ontario) a meteor radar design to measure vertical transfer of horizontal momentum flux in the MLT by GWs. In particular he has deployed two of these radars in Southern Argentina and King George Island, Antarctica. At NASA, Dr. Janches is currently developing a Spaceborne Na Lidar concept to be deployed in the International Space Station in order to study globally small-scale dynamics in the MLT. He has over 50 publications in Peer-Reviewed journals

    Asteroid 24411 Janches is named after him.



    Selected Publications

    Refereed

    Janches, D., P. Pokorný, M. Sarantos, et al. J. R. Szalay, M. Horányi, and D. Nesvorný. 2018. "Constraining the ratio of micrometeoroids from Short and Long Period Comets at 1 AU from LADEE observations of the Lunar Dust Cloud." Geophysical Research Letters [10.1002/2017gl076065]

    Jenniskens, P., J. Baggaley, I. Crumpton, et al. P. Aldous, P. Pokorny, D. Janches, P. S. Gural, D. Samuels, J. Albers, A. Howell, C. Johannink, M. Breukers, M. Odeh, N. Moskovitz, J. Collison, and S. Ganju. 2018. "A survey of southern hemisphere meteor showers." Planetary and Space Science [10.1016/j.pss.2018.02.013]

    Liu, G., S. L. England, R. J. Lillis, et al. P. Withers, P. R. Mahaffy, D. E. Rowland, M. Elrod, M. Benna, D. M. Kass, D. Janches, and B. Jakosky. 2018. "Thermospheric Expansion Associated With Dust Increase in the Lower Atmosphere on Mars Observed by MAVEN/NGIMS." Geophysical Research Letters 45 (7): 2901-2910 [10.1002/2018gl077525]

    Panka, P. A., A. A. Kutepov, L. Rezac, et al. K. S. Kalogerakis, A. G. Feofilov, D. Marsh, D. Janches, and E. Yiğit. 2018. "Atomic oxygen retrieved from the SABER 2.0 and 1.6 μm radiances using new first-principles nighttime OH(v) model." Geophysical Research Letters (In Press) [10.1029/2018gl077677]

    De Wit, R., D. Janches, D. C. Fritts, R. G. Stockwell, and L. Coy. 2017. "Unexpected Climatological Behavior of MLT Gravity Wave Momentum Flux in the Lee of the Southern Andes Hotspot." Geophysical Research Letters [10.1002/2016GL072311]

    McCormack, J., K. Hoppel, D. Kuhl, et al. R. de Wit, G. Stober, P. Espy, N. Baker, P. Brown, D. Fritts, C. Jacobi, D. Janches, N. Mitchell, B. Ruston, S. Swadley, K. Viner, T. Whitcomb, and R. Hibbins. 2017. "Comparison of mesospheric winds from a high-altitude meteorological analysis system and meteor radar observations during the boreal winters of 2009–2010 and 2012–2013." Journal of Atmospheric and Solar-Terrestrial Physics 154 132-166 [10.1016/j.jastp.2016.12.007]

    Thomas, E., J. Simolka, M. DeLuca, et al. M. Horányi, D. Janches, R. A. Marshall, T. Munsat, J. M. Plane, and Z. Sternovsky. 2017. "Experimental setup for the laboratory investigation of micrometeoroid ablation using a dust accelerator." Review of Scientific Instruments 88 (3): 034501 [10.1063/1.4977832]

    Pokorny, P., D. Janches, P. Brown, and J. Hormaechea. 2017. "An Orbital Meteoroid Stream Survey using the Southern Argentina Agile MEteor Radar (SAAMER) based on a Wavelet approach." Icarus 162-182 [10.1016/j.icarus.2017.02.025]

    Swarnalingam, N., W. Hocking, D. Janches, and J. Drummond. 2017. "Observation of Polar Mesosphere Summer Echoes Using the Northernmost MST Radar at Eureka (80N)." Journal of Atmospheric and Solar Terrestrial Physics [10.1016/j.jastp.2017.03.015]

    Schult, C., G. Stober, D. Janches, and J. L. Chau. 2017. "Results of the first continuous meteor head echo survey at polar latitudes." Icarus 1-13 [10.1016/j.icarus.2017.06.019]

    Pokorný, P., M. Sarantos, and D. Janches. 2017. "Reconciling the Dawn–Dusk Asymmetry in Mercury’s Exosphere with the Micrometeoroid Impact Directionality." The Astrophysical Journal Letters 842 (2): L17 [10.3847/2041-8213/aa775d]

    Janches, D., N. Swarnalingam, J. D. Carrillo-Sanchez, et al. J. C. Gomez-Martin, R. Marshall, D. Nesvorný, J. M. Plane, W. Feng, and P. Pokorný. 2017. "Radar Detectability Studies of Slow and Small Zodiacal Dust Cloud Particles. III. The Role of Sodium and the Head Echo Size on the Probability of Detection." The Astrophysical Journal 843 (1): 1 [10.3847/1538-4357/aa775c]

    Federico Conte, J., J. L. Chau, G. Stober, et al. N. Pedatella, A. Maute, P. Hoffmann, D. Janches, D. Fritts, and D. J. Murphy. 2017. "Climatology of semidiurnal lunar and solar tides at mid and high latitudes: interhemispheric comparison." Journal of Geophysical Research: Space Physics [10.1002/2017ja024396]

    Abedin, A., P. Wiegert, D. Janches, et al. P. Pokorný, P. Brown, and J. L. Hormaechea. 2017. "Formation and past evolution of the showers of 96P/Machholz complex." Icarus [10.1016/j.icarus.2017.07.015]

    de Wit, R. J., D. Janches, D. C. Fritts, and R. E. Hibbins. 2016. "QBO modulation of the mesopause gravity wave momentum flux over Tierra del Fuego." Geophysical Research Letters [10.1002/2016gl068599]

    Plane, J. M., J. C. Gómez-Martín, W. Feng, and D. Janches. 2016. "Silicon chemistry in the mesosphere and lower thermosphere." J. Geophys. Res. Atmos. 78 (4): 734-745 [10.1002/2015jd024691]

    Thomas, E., M. Horányi, D. Janches, et al. T. Munsat, J. Simolka, and Z. Sternovsky. 2016. "Measurements of the ionization coefficient of simulated iron micrometeoroids." Geophysical Research Letters 43 (8): 3645-3652 [10.1002/2016gl068854]

    Dawkins, E., J. M. Plane, M. P. Chipperfield, et al. W. Feng, D. R. Marsh, J. Hoeffner, and D. Janches. 2016. "Solar cycle response and long-term trends in the mesospheric metal layers." JGR- Space Physics [10.1002/2016JA022522]

    Panka, P. A., A. A. Kutepov, K. S. Kalogerakis, et al. D. Janches, J. M. Russell, L. Rezac, A. G. Feofilov, M. G. Mlynczak, and E. Yiğit. 2016. "Resolving the mesospheric nighttime 4.3 μm emission puzzle: New model calculations improve agreement with SABER observations." Atmospheric Chemistry and Physics Discussions 1-13 [10.5194/acp-2016-766]

    Carrillo-Sánchez, J. D., D. Nesvorný, P. Pokorný, D. Janches, and J. M. Plane. 2016. "Sources of Cosmic Dust in the Earth's Atmosphere." Geophysical Research Letters [10.1002/2016gl071697]

    Michell, R. G., D. Janches, M. Samara, et al. J. Hormaechea, C. Brunini, I. Bibbo, and D. C. Fritts. 2015. "Optical observations of meteor head echoes observed with the SAAMER radar ." Planetary and Space Science (In Press) [doi:10.1016/j.pss.2015.04.018]

    Brunini, C., F. Azpilicueta, and D. Janches. 2015. "An Attempt to establish a statistical model of the day-to-day variability of the NmF2 and hmF2 parameters computed from IRI." Advances in Space Research 55 (8): 2033–2040 [doi:10.1016/j.asr.2014.07.023]

    Janches, D., N. Swarnalingam, J. M. Plane, et al. D. Nesvorny, W. Feng, D. Vokrouhlický, and M. J. Nicolls. 2015. "Radar detectability studies of slow and small Zodiacal Dust Cloud Particles: II. A study of three radars with different sensitivity." Astrophysical Journal 807 (13): [10.1088/0004-637X/807/1/13]

    Janches, D., S. Close, J. Hormaechea, et al. N. Swarnalingam, A. Murphy, D. O'Connor, B. Vandepeer, B. Fuller, D. C. Fritts, and C. Brunini. 2015. "The Southern Argentina Agile MEteor Radar Orbital System (SAAMER-OS): An Initial Sporadic Meteoroid Orbital Survey in the Southern Sky." Astrophysical Journal 809 [10.1088/0004-637X/809/1/36]

    Carrillo-Sanchez, J. D., J. M. Plane, W. Feng, D. Nesvorny, and D. Janches. 2015. "On the size and velocity distribution of cosmic dust particles entering the 1 atmosphere." Geophys. Res. Lett 6518–6525 [10.1002/2015GL065149]

    Imura, H., D. C. Fritts, D. Janches, and W. Singer. 2015. "Interhemispheric comparison of the 5-day wave planetary wave from meteor radar wind measurements." Annales Geophysicae 1349-1359 [10.5194/angeo-33-1349-2015]

    Michell, R., D. Janches, M. Samara, et al. J. Hormaechea, C. Brunini, and I. Bibbo. 2015. "Simultaneous optical and radar observations of meteor head-echoes utilizing SAAMER." Planetary and Space Science 118 95-101 [10.1016/j.pss.2015.04.018]

    Janches, D., W. Hocking, S. Pifko, et al. J. L. Hormaechea, D. C. Fritts, C. Brunini, R. Michell, and M. Samara. 2014. "Interferometric meteor head echo observations using the Southern Argentina Agile Meteor Radar." Journal of Geophysical Research - Space Physics 119 [10.1002/2013JA019241]

    Langowski, M., C. von Sacigny, J. Burrows, et al. W. Feng, J. M. Plane, D. R. Marsh, D. Janches, M. Sinnhuber, and A. C. Aikin. 2014. "Global investigation of the Mg atom and ion layers using SCIAMACHY/Envisat observations between 70 km and 150 km altitude and WACCM-Mg model results." Atmospheric Chemistry & Physics Discussions 14 1971-2019 [10.5194/acpd-14-1971-2014]

    Krainak, M. A., A. W. Yu, D. Janches, et al. S. L. Jones, B. Blagojevic, and J. R. Chen. 2014. "Self-Raman Nd:YVO4 laser and electro-optic technology for space-based sodium lidar instrument." Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices 8959 [10.1117/12.2041453]

    Plane, J. M., W. Feng, E. Dawkins, et al. M. P. Chipperfield, J. Hoffner, D. Janches, D. R. Marsh, and E. Dawkins. 2014. "Resolving the strange behaviour of extra-terrestrial potassium in the upper atmosphere." Geophysical Research Letters 41 [10.1002/2014GL060334]

    Robertson, S., S. Dickson, M. Horanyi, et al. Z. Stenovsky, M. Friedrich, D. Janches, L. Megner, and B. Williams. 2014. "Detection of meteoric smoke particles in the mesosphere by a rocket-borne mass spectrometer." Journal of Atmospheric and Solar-Terrestrial Physics 118 161-179

    Janches, D., J. M. Plane, D. Nesvorny, et al. W. Feng, D. Vokoruhlicky, and M. J. Nicolls. 2014. "Radar detectability studies of slow and small Zodiacal Dust Cloud Particles: 1. The case of the Arecibo 430 MHz meteor head echo observations." Astrophysical Journal 796 (41): [10.1088/0004-637X/796/1/41]

    Pifko, S., D. Janches, S. Close, et al. J. J. Sparks, T. Nakamura, and D. Nesvorny. 2013. "The Meteoroid Input Function and predictions of mid-latitude meteor observations by the MU radar." Icarus 223 444-459 [10.1016/j.icarus.2012.12.014]

    Janches, D., J. L. Hormaechea, C. Brunini, W. Hocking, and D. C. Fritts. 2013. "An initial meteoroid stream survey in the southern hemisphere using the Southern Argentina Agile Meteor Radar (SAAMER)." Icarus 223 677-683 [10.1016/j.icarus.2012.12.018]

    Feng, W., D. R. Marsh, M. P. Chipperfield, et al. D. Janches, J. Hoffner, F. Yi, and J. M. Plane. 2013. "A global atmospheric model of meteoric iron." Journal of Geophysical Research - Atmospheres 118 9456–9474 [10.1002/jgrd.50708]

    Marsh, D. R., D. Janches, W. Feng, and J. M. Plane. 2013. "A global model of meteoric sodium." Journal of Geophysical Research - Atmospheres 118 11,442–11,452 [10.1002/jgrd.50870]

    Andrioli, V. F., D. C. Fritts, P. P. Batista, B. R. Clemesha, and D. Janches. 2013. "Diurnal variation in gravity wave activity at low and middle latitudes." Annales Geophysicae 31 2123-2135 [10.5194/angeo-31-2123-2013]

    Fritts, D. C., D. Janches, H. Himura, et al. W. K. Hocking, J. V. Bageston, and N. M. Leme. 2012. "Drake Antarctic Agile Meteor Radar first results: Configuration and comparison of mean and tidal wind and gravity wave momentum flux measurements with Southern Argentina Agile Meteor Radar." Journal of Geophysical Research - Atmospheres 117 D02105 [10.1029/2011JD016651]

    Fritts, D. C., H. Imura, R. Lieberman, D. Janches, and W. Singer. 2012. "A conjugate study of mean winds and planetary waves employing enhanced meteor radars at Rio Grande, Argentina (53.8°S) and Juliusruh, Germany (54.6°N)." Journal of Geophysical Research - Atmospheres 117 D05117 [10.1029/2011JD016305]

    Fritts, D. C., D. Janches, W. K. Hocking, N. J. Mitchell, and M. J. Taylor. 2012. "Assessment of gravity wave momentum flux measurement capabilities by meteor radars having different transmitter power and antenna configurations." Journal of Geophysical Research - Atmospheres 117 D10108, [10.1029/2011JD017174]

    Nicholls, M. J., D. C. Fritts, D. Janches, and C. Heinselman. 2012. "Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar." Annales Geophysicae 30 945-962 [10.5194/angeo-30-945-2012]

    Gardner, C. S., X. Chu, P. Espy, et al. J. M. Plane, D. R. Marsh, and D. Janches. 2011. "Seasonal variations of the mesospheric Fe layer at Rothera, Antarctica (67.5°S, 68.0°W)." Journal of Geophysical Research - Atmospheres 116 D02304 [10.1029/2010JD014655]

    Cooke, W. J., D. E. Moser, B. F. Hardin, and D. Janches. 2011. "Meteoroids: The Smallest Solar System Bodies." NASA/CP—2011–216469

    Nesvorny, D., D. Vokrouhlicky, P. Pokorny, and D. Janches. 2011. "Dynamics of Dust Particles Released from Oort Cloud Comets and Their Contribution to Radar Meteors." The Astrophysical Journal 743 (1): 37 [10.1088/0004-637X/743/1/37]

    Nesvorny, D., D. Janches, D. Vokrouhlicky, et al. P. Pokorny, W. F. Bottke, and P. Jenniskens. 2011. "Dynamical Model for the Zodiacal Cloud and Sporadic Meteors." The Astrophysical Journal 743 (2): 129 [10.1088/0004-637X/743/2/129]

    Sparks, J. J., D. Janches, M. J. Nicolls, and C. Heinselman. 2010. "Determination of physical and radiant meteor properties using PFISR interferometry measurements of head echoes." Journal of Atmospheric and Solar Terrestrial Physics 72 1221-1230

    Fritts, D. C., D. Janches, H. Imura, et al. W. K. Hocking, N. J. Mitchell, R. G. Stockwell, B. Fuller, B. Vandepeer, J. Hormaechea, C. Brunini, and H. Levato. 2010. "Southern Argentina Agile Meteor Radar: System design and initial measurements of large‐scale winds and tides." Journal of Geophysical Research - Atmospheres 115 (D18112): [10.1029/2010JD013850]

    Fritts, D. C., D. Janches, and W. K. Hocking. 2010. "Southern Argentina Agile Meteor Radar: Initial assessment of gravity wave momentum fluxes." Journal of Atmospheric Research - Atmospheres 115 D19123 [10.1029/2010JD013891]

    Janches, D., and L. P. Dyrud. 2009. "First observation of micrometeoroid differential ablation in the atmosphere." Geophysical Research Letters 36 L06101 [10.1029/2009GL037389]

    Sparks, J. J., and D. Janches. 2009. "Latitudinal dependence of the variability of the micrometeor altitude distribution." Geophysical Research Letters 36 L12105 [10.1029/2009GL038485]

    Fentzke, J. T., D. Janches, I. Strelnikova, and M. Rapp. 2009. "Meteoric smoke particle properties derived using dual-beam Arecibo UHF observations of D-region spectra during different seasons." Journal of Atmospheric and Solar Terrestrial Physics 71 1982-1991

    Sparks, J. J., and D. Janches. 2009. "Correction to ‘‘Latitudinal dependence of the variability of the micrometeor altitude distribution’’." Geophysical Research Letters 36 L17101 [10.1029/2009GL039987]

    Fritts, D. C., and D. Janches. 2008. "Dual-beam measurements of gravity waves over Arecibo: Re-evualation of wave structure, dynamics and momentum fluxes." Journal of Geophysical Research - Atmospheres 113 D05112 [10.1029/2007JD008896]

    Fentzke, J. T., and D. Janches. 2008. "A semi-empirical model of the contribution from sporadic meteoroid sources on the meteor input function in the MLT observed at Arecibo." Journal of Geophysical Research - Space Physics 113 A03304 [10.1029/2007JA012531]

    Dyrud, L. P., and D. Janches. 2008. "Modeling the meteor head-echo using Arecibo radar observations." Journal of Atmospheric and Solar-Terrestrial Physics 70 1621-1632 [10.1016/j.jastp.2008.06.016]

    Fentzke, J. T., D. Janches, and J. J. Sparks. 2008. "Latitudinal and seasonal variability of the micrometeor input function: A study using model predictions and observations from Arecibo and PFISR." Journal of Atmospheric and Solar-Terrestrial Physics 71 653-661 [10.1016/j.jastp.2008.07.015]

    Sparks, J. J., D. Janches, M. J. Nicolls, and C. J. Heinselman. 2008. "Seasonal and diurnal variability of the meteor flux at high latitude observed using PFISR." Journal of Atmospheric and Solar-Terrestrial Physics 71 688-696 [10.1016/j.jastp.2008.08.009]

    Janches, D., D. C. Fritts, M. J. Nicolls, and C. J. Heinselamn. 2008. "Observations of D-region Structure and Atmospheric Tides with PFISR during Active Aurora." Journal of Atmospheric and Solar-Terrestrial Physics 71 688-696

    Vondrak, T., J. M. Plane, S. Broadley, and D. Janches. 2008. "A chemical model of meteoric ablation." Atmospheric Chemistry and Physics 8 7015-7031

    Janches, D., and M. J. Nicolls. 2007. "Diurnal variability of the gyro resonance line observed with the Arecibo incoherent scatter radar at E- and F1 -region altitudes." Geophysical Research Letters 34 L01103 [10.1029/2006GL028510]

    Janches, D., S. Close, and J. T. Fentzke. 2007. "A comparison of detection sensitivity between ALTAIR and Arecibo meteor observations: Can High Power and Large Aperture radars detect low velocity meteor head-echoes,." Icarus 193 105-111 [10.1016/j.icarus.2007.08.022]

    Lau, E. M., S. K. Avery, J. P. Avery, et al. D. Janches, S. E. Palo, R. Schafer, and N. A. Makarov. 2006. "Statistical characterization of the meteor distribution at the South Pole using VHF interferometric meteor radar." Radio Science 41 RS4007 [10.1029/2005RS003247,]

    Janches, D., C. J. Heinselman, J. L. Chau, A. Chandran, and R. Woodman. 2006. "Modeling the global micrometeor input function in the upper atmosphere observed by high power and large aperture radars." Journal of Geophysical Research - Space Physics 111 A07317 [10.1029/2006JA011628]

    Fritts, D. C., D. Janches, D. M. Riggin, et al. R. G. Stockwell, M. P. Sulzer, and S. Gonzalez. 2006. "Gravity waves and momentum fluxes in the mesosphere and lower thermosphere using 430 MHz dual-beam measurements at Arecibo: 2. Frequency spectra, momentum fluxes, and variability." Journal of Geophysical Research - Atmospheres 111 (D18108): [10.1029/2005JD006883]

    Janches, D., D. C. Fritts, D. M. Riggin, M. P. Sulzer, and S. Gonzalez. 2006. "Gravity waves and momentum fluxes in the mesosphere and lower thermosphere using 430 MHz dual-beam measurements at Arecibo: 1. Measurements, methods, and gravity waves." Journal of Geophysical Research - Atmospheres 111 D18107 [10.1029/2005JD006882]

    Janches, D., and J. L. Chau. 2005. "Observed diurnal and seasonal behavior of the micrometeor flux using the Arecibo and Jicamarca radars." Journal of Atmospheric and Solar-Terrestrial Physics 67 1196-1210 [10.1016/j.jastp.2005.06.011]

    Wen, C.-H., J. F. Doherty, J. D. Mathews, and D. Janches. 2005. "Meteor detection and non-periodic bursty interference removal for Arecibo data." Journal of Atmospheric and Solar-Terrestrial Physics 67 (3): 275-281 [10.1016/j.jastp.2004.10.004]

    Dyrud, L. P., K. Denney, J. Urbina, et al. D. Janches, E. Kudeki, and S. Franke. 2005. "The meteor flux: It depends how you look." Earth, Moon, and Planets 95 89-100 [10.1007/s11038-005-9001-6]

    de la Pena, S., S. K. Aery, J. P. Avery, E. Lau, and D. Janches. 2005. "Wind measurements of MLT region using the Platteville, CO MEDAC 50MHz meteor radar." Journal of Atmospheric and Solar-Terrestrial Physics 67 1211-1215 [10.1016/j.jastp.2005.06.009]

    Friedman, J. S., and D. Janches. 2005. "Special issue on meteors and the mesopause." Journal of Atmospheric and Solar-Terrestrial Physics 67 1157-1158 [10.1016/j.jastp.2005.06.001]

    Janches, D., and D. O. ReVelle. 2005. "The Initial Altitude of the Micrometeor Phenomenon: Comparison between Arecibo radar observations and theory." Journal of Geophysical Research 110 A08307 [10.1029/2005JA011022]

    Raizada, S., C. A. Tepley, D. Janches, et al. J. S. Friedman, Q. H. Zhou, and J. D. Mathews. 2004. "Lidar observations of Ca and K metallic layers from Arecibo and comparison with micrometeor sporadic activity." Journal of Atmospheric and Solar-Terrestrial Physics 66 (6-9): 595-606 [10.1016/j.jastp.2004.01.030]

    Janches, D., M. C. Nolan, and M. P. Sulzer. 2004. "Radiant measurement accuracy of micrometeors detected by the Arecibo 430 MHz Dual-Beam Radar." Atmospheric Chemistry and Physics 4 621-626 [1680-7324/acp/2004-4-621]

    Zhou, Q. H., Y. T. Morton, J. D. Mathews, and D. Janches. 2004. "Aspect sensitivity of VHF echoes from field aligned irregularities in meteor trails and thin ionization layers." Atmospheric Chemistry and Physics 4 685-692 [1680-7324/acp/2004-4-685]

    Janches, D., S. E. Palo, E. M. Lau, et al. S. K. Avery, J. P. Avery, S. de la Pena, and N. A. Makarov. 2004. "Diurnal and seasonal variability of the meteor flux at the South Pole measured with radars." GEOPHYSICAL RESEARCH LETTERS 31 L20807 [10.1029/2004GL021104]

    Janches, D., M. C. Nolan, D. D. Meisel, et al. J. D. Mathews, Q. H. Zhou, and D. E. Moser. 2003. "On the geocentric micrometeor velocity distribution." Journal of Geophysical Research - Space Physics 108 (A6): 1222 [10.1029/2002JA009789]

    Mathews, J. D., J. D. Doherty, C.-H. Wen, et al. S. J. Briczinski, D. Janches, and D. D. Meisel. 2003. "An update on the UHF radar meteor observation at Arecibo Observatory." Journal of Atmospheric and Solar-Terrestrial Physics 65 1139– 1149 [10.1016/j.jastp.2003.07.009]

    Meisel, D. D., D. Janches, and J. D. Mathews. 2002. "Extrasolar Micrometeors Radiating from the Vicinity of the Local Interstellar Bubble." Astrophysical Journal 567 323-341

    Meisel, D. D., D. Janches, and J. D. Mathews. 2002. "The Size Distribution of the Arecibo Interstellar Particles and its Implications." Astrophysical Journal 579 895–904

    Janches, D., A. Pellinen-Wannberg, G. Wanberg, et al. A. Westman, I. Haggstrom, and D. D. Meisel. 2002. "Tristatic Observations of Meteors Using the 930 MHz EISCAT radar." Journal of Geophysical Research - Space Physics 107 (A11): 1389 [:10.1029/2001JA009205]

    Janches, D., D. D. Meisel, and J. D. Mathews. 2001. "Orbital Properties of the Arecibo Micrometeors at Earth Intersection." Icarus 150 205-218 [10.1006/icar.2000.6575]

    Mathews, J. D., D. Janches, D. D. Meisel, and Q. Q. Zhou. 2001. "The Micrometeoroid Mass Flux into the Upper Atmosphere: Arecibo Results and a Comparison with Prior Estimates." Geophysical Research Letters 28 (10): 1929-193

    Janches, D., J. D. Mathews, D. D. Meisel, V. S. Getman, and Q. H. Zhou. 2000. "Doppler Studies of Near-Antapex UHF Radar Micrometeors." Icarus 143 347-353 [0.1006/icar.1999.6257]

    Janches, D., J. D. Mathews, D. D. Meisel, and Q. H. Zhou. 2000. "Micrometeor Observation using the Arecibo 430 MHz Radar: I. Determination of the Ballistic Parameter from measured Doppler Velocity and Deceleration Results,." Icarus 145 53-63

                                                                                                                                                                                            
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