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.
Diego Janches
(RESEARCH AST, FIELDS AND PARTICLES)
| Email: | diego.janches@nasa.gov |
| Phone: | 301.286.0597 |
| Org Code: | 674 |
| Address: |
NASA/GSFC Mail Code 674 Greenbelt, MD 20771 |
| Employer: |
Brief Bio
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
Research Astrophysicist, Fields and Particles
National Aeronautics and Space Admonistration - Goddard Space Flight Center
October 2010 - Present
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.
Sr. Research Associate
NorthWest Research Associates (NWRA) - Boulder, CO USA
February 2005 - October 2010
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.
Research Scientist II
Cooperative Institute for Research in Environmental Science University of Colorado - Boulder, CO USA
February 2004 - February 2005
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.
Research Associate
Arecibo Observatory Cornell University - Arecibo, Puerto Rico
August 2003 - February 2004
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.
NSF/CEDAR Postdoctoral Fellow
Penn State University - Arecibo Observatory, Arecibo, Puerto Rico
August 2001 - August 2003
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.
Postdoctoral Fellow
Swedish Institute of Space Physics - Kiruna, Sweden
January 2001 - August 2001
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.
Graduate Research Assistant
Department of Electrical Engineering Penn State University - University Park, PA USA
August 1996 - December 2000
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.
Graduate Research Assistant
Department of Astronomy and Astrophysics Penn State University - University Park, PA USA
August 1994 - August 1996
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.
Research Assistant
Department of Astronomy and Astrophysics Penn State University - University Park, PA USA
August 1993 - August 1994
Undergraduate Teaching Assistant
Department of Physics University of Buenos Aires - Buenos Aires, Argentina
1990 - 1993
Undergraduate Research Assistant
Department of Medical Physics Hospital Oncologico Angel H. Roffo - Buenos Aires, Argentina
1989 - 1991
Professional Societies
Division of Planetary Science of the American Astronomical Society
2010 - Present
International Astronomical Union
Member of Commission 22
2012 - Present
American Geophysical Union
2000 - Present
International Union of Radio Science
Commission G
2000 - Present
Professional Service
-Guest Editor of Special issue: Meteoroids 2019 on Planetary and Space Science
-Chair of Scientific Organizing Committee, Meteoroids 2019, Bratislava, Slovakia, June 2019
-President of IAU Commission F1 Meteors, Meteorites and Interplanetary Dust, 2018-2021
-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
- 10/2022 U.S. State Department Embassy Science Fellowship
- 8/2022 Heliophysics Peer Award
- 4/7/21 GSFC Special Act Award For writing and wining a proposal to fly a sodium lidar on a balloon
- 3/25/21 GSFC Special Act Award For Carrying out the Division PCard Procurement
- 09/2020-- NASA Exceptional Scientific Achievement Medal
- 06/2020 – Robert H. Goddard Honor Award for Science
- 10/1/19– Patent Number 10,429,243, ”Space-Based Sodium Lidar Instrument and Method of Operation”
- 08/2017– Heliophysics Peer Award
- 07/2014 –Asteroid 24411 Janches named after Dr. Diego Janches for his contributions to meteor science using radars
- 03/2011 – U.S. Department of Defense Antarctic Service Medal.
- 03/2009 – 04/2009, Short Term Visit Fellowship, Japanese Society for the Promotion of Science, Kyoto, Japan.
- 08/2007 – Travel Award to attend the EISCAT Workshop, Aland Islands, Finland.
- 07/2007 IUGG Travel Award to attend the IUGG Metting, Perugia, Italy
- 2001 – 2003 CEDAR/NSF Post Doctoral Fellowship. The Pennsylvania State University, USA.
- 04/2000 – IAU Travel Grant to attend the IAU Colloquium No. 181:Dust in the Solar System and Other Planetary Systems, Canterbury, UK.
- 04/2000 – A. J. Ferraro Graduate Research Award, University Park, PA
Grants
A radar and optical survey of meteor showers with southern ecliptic radiants - NASA Planetary Science Division - Solar System Observations - Awarded: 2016-08-31
Dates: 2016-08-31 - 2019-08-30
Experimental Investigation of micrometeoroid ablation - NASA - Heliophysics Science Division - Awarded: 2015-03-31
Dates: 2015-03-31 - 2018-03-30
METEORIC PLASMA LAYERS ON VENUS AND MARS - NASA (Planetary Atmosphere) - Awarded: 2013-01-01
Dates: 2013-04-01 - 2016-03-31
Amount $159,005
Orbital Studies of the Zodiacal Dust Cloud utilizing radar observations and models - NASA (Planetary Astronomy) - Awarded: 2013-01-01
Dates: 2013-04-01 - 2016-03-31
Amount $283,775
PASI on Dynamics and Chemistry of the Mesosphere and Thermosphere: Promoting Inter-American Collaborations - NSF - Awarded: 2009-09-15
Dates: 2009-09-15 - 2011-09-14
Amount $97,000
Large and Small-scale Dynamics and Meteor Studies in the MLT with a New-generation Meteor Radar on King George Island - NSF-OPP - Awarded: 2009-08-15
Dates: 2009-08-15 - 2013-07-31
Amount $750,000
Scienti c, educational and logistical preparation for AMISR relocation to Argentina - NSF-UAF - Awarded: 2009-09-01
Dates: 2009-09-01 - 2012-08-31
Amount $400,000
Orbital Studies of Interplanetary and Interstellar dust upgrading a sophisticated meteor radar - NSF-Astronomy&Astrophysics - Awarded: 2009-09-01
Dates: 2009-09-01 - 2013-08-31
Amount $400,000
International:Student Participation in a Unique Meteor Radar for Atmospheric Studies in Argentina - NSF-OISE - Awarded: 2008-08-01
Dates: 2008-08-01 - 2011-07-31
Amount $110,128
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 - Awarded: 2006-07-01
Dates: 2006-07-01 - 2009-06-30
Dynamics and Meteor Studies Using a Novel Radar at a Critical Southern Latitude - NSF-Aeronomy - Awarded: 2007-06-01
Dates: 2007-06-01 - 2011-05-31
Amount $629,999
Collaborative studies of the Antarctic Mesosphere and Lower Thermosphere - NSF-OPP - Awarded: 2006-07-01
Dates: 2006-07-01 - 2006-06-30
Momentum Flux Studies of the MLT Using the 430 MHz Dual Beam Arecibo Observatory - Cornell University - Awarded: 2005-03-01
Dates: 2005-03-01 - 2007-02-28
Amount $87,399
Collaborative Research: High-time-resolution resonance lidar detection of meteor trails - NSF-Aeronomy - Awarded: 2005-09-01
Dates: 2005-09-01 - 2010-08-31
Amount $455,713
Micrometeors and Their Interaction with the Atmosphere: A Comprehensive Study Using the Arecibo and Jicamarca Observatories - NSF-Aeronomy - Awarded: 2004-08-01
Dates: 2008-08-01 - 2009-07-31
Amount $462,099
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 - Awarded: 2001-10-01
Dates: 2010-10-01 - 2003-09-30
Amount $100,000
Constraining Na and K in the lunar exosphere and surface with LADEE data and models
Lunar Data Analysis Program - NASA (NNH15ZDA001N-LDAP) - Awarded: 2016-10-01
Dates: 2016-10-01 - 2019-09-30
Development of a Sodium Lidar for Spaceborne Missions
heliophysics Instrument and Technology Development for Science - NASA (NNH16ZDA001N-HTIDS) - Awarded: 2016-12-09
Dates: -
Study of IR emissions of CO2 and OH in the mesosphere and lower thermosphere using SABER/TIMED observations
Heliophysics Guest Investigator - NASA - Awarded: 2016-08-31
Dates: 2016-10-01 - 2019-09-30
Publications
Refereed
2024. "Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars." Journal of Geophysical Research: Atmospheres 129 (21): [10.1029/2024jd040978] [Journal Article/Letter]
2024. "Water Generation on the Moon from Solar Wind and Meteoroid Impacts." The Planetary Science Journal 5 (171): [10.3847/PSJ/ad5542] [Journal Article/Letter]
2024. "Accretion of Meteoric Organic Matter at the Surface of Mars and Potential Production of Methane by Ultraviolet Radiation." The Planetary Science Journal 5 (7): 160 [https://dx.doi.org/10.3847/PSJ/ad54c9] [Journal Article/Letter]
2024. "Radar observation of the new lambda -Sculptorid meteor shower." Astronomy & Astrophysics [10.1051/0004-6361/202450281] [Journal Article/Letter]
2024. "SWOL2023: Report of Space Weather Observations Throughout Latinoamerica: Filling the Southern Gaps." Space Weather 22 (5): [10.1029/2024sw003861] [Journal Article/Letter]
2024. "Gravity waves generated by the Hunga Tonga–Hunga Ha′apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude general Mechanistic Circulation Model." Atmospheric Chemistry and Physics 24 (8): 4851-4873 [10.5194/acp-24-4851-2024] [Journal Article/Letter]
2023. "A novel methodology to estimate pre-atmospheric dynamical conditions of small meteoroids." Planetary and Space Science 105796 [10.1016/j.pss.2023.105796] [Journal Article/Letter]
2023. "Gravity waves generated by the Hunga Tonga-Hunga Ha‘apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude General Mechanistic Circulation Model." [10.5194/egusphere-2023-1714] [Journal Article/Letter]
2023. "Polarization dependency of transverse scattering and collisional coupling to the ambient atmosphere from meteor trails - theory and observations." Planetary and Space Science 105768 [10.1016/j.pss.2023.105768] [Journal Article/Letter]
2023. "Radar Observations of the Arid Meteor Shower Outburst from Comet 15P/Finlay." The Planetary Science Journal 4 (9): 165 [10.3847/psj/ace82a] [Journal Article/Letter]
2023. "Solar Cycle and Long‐Term Trends in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars." Geophysical Research Letters 50 (2): [10.1029/2022gl101953] [Journal Article/Letter]
2022. "A Modeling Study of the Seasonal, Latitudinal, and Temporal Distribution of the Meteoroid Mass Input at Mars: Constraining the Deposition of Meteoric Ablated Metals in the Upper Atmosphere." The Planetary Science Journal 3 (239): 29 [https://doi.org/10.3847/PSJ/ac8540] [Journal Article/Letter]
2022. "Selenographic and Local Time Dependence of Lunar Exospheric Sodium as Observed by LADEE." The Planetary Science Journal 3 (9): 220 [10.3847/psj/ac8805] [Journal Article/Letter]
2022. "Radar observations of winds, waves and tides in the mesosphere and lower thermosphere over South Georgia island (54° S, 36° W) and comparison with WACCM simulations." Atmospheric Chemistry and Physics 22 (14): 9435-9459 [10.5194/acp-22-9435-2022] [Journal Article/Letter]
2022. "Meteor Radar vertical wind observation biases and mathematical debiasing strategies including a 3DVAR+DIV algorithm." [10.5194/egusphere-2022-203] [Journal Article/Letter]
2022. "Differential Ablation of Organic Coatings From Micrometeoroids Simulated in the Laboratory." Journal of Geophysical Research: Planets 127 (4): [10.1029/2021je007168] [Journal Article/Letter]
2022. "Comparative Na and K Mercury and Moon Exospheres." Space Science Reviews 218 (1): 2 [10.1007/s11214-022-00871-w] [Journal Article/Letter]
2021. "An Improved Method to Measure Head Echoes Using a Meteor Radar." The Planetary Science Journal 2 (5): 197 [10.3847/psj/ac22b2] [Journal Article/Letter]
2021. "Climatology of quasi-2-day wave structure and variability at middle latitudes in the northern and southern hemispheres." Journal of Atmospheric and Solar-Terrestrial Physics 105690 [10.1016/j.jastp.2021.105690] [Journal Article/Letter]
2021. "Wind Variations in the Mesosphere and Lower Thermosphere Near 60°S Latitude During the 2019 Antarctic Sudden Stratospheric Warming." Journal of Geophysical Research: Space Physics 126 (5): [10.1029/2020ja028909] [Journal Article/Letter]
2021. "Meteoroids as One of the Sources for Exosphere Formation on Airless Bodies in the Inner Solar System." Space Science Reviews 217 (4): 50 [10.1007/s11214-021-00827-6] [Journal Article/Letter]
2021. "Mesospheric Mountain Wave Activity in the Lee of the Southern Andes." Journal of Geophysical Research: Atmospheres [10.1029/2020jd033268] [Journal Article/Letter]
2021. "Observation of the A Carinid Meteor Shower 2020 Unexpected Outburst." The Planetary Science Journal 2 (2): 56 [10.3847/psj/abe9af] [Journal Article/Letter]
2020. "SOUTHTRAC-GW: An airborne field campaign to explore gravity wave dynamics at the world’s strongest hotspot." Bulletin of the American Meteorological Society 1-60 [10.1175/bams-d-20-0034.1] [Journal Article/Letter]
2020. "Simultaneous retrievals of nighttime O( 3 P) and total OH densities from satellite observations of Meinel band emissions." Geophysical Research Letters [10.1029/2020gl091053] [Journal Article/Letter]
2020. "A Comparative Modeling Study of the Seasonal, Temporal, and Spatial Distribution of Meteoroids in the Upper Atmospheres of Venus, Earth, and Mars." The Planetary Science Journal 1 (3): 59 [10.3847/psj/abba35] [Journal Article/Letter]
2020. "First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes." Geophysical Research Letters 47 (17): [10.1029/2020gl088845] [Journal Article/Letter]
2020. "Seasonal evolution of winds, atmospheric tides and Reynolds stress components in the Southern hemisphere mesosphere/lower thermosphere in 2019." Annales Geophysicae Discussion [10.5194/angeo-2020-55] [Journal Article/Letter]
2020. "A Global Fireball Observatory." Planetary and Space Science 191 105036 [10.1016/j.pss.2020.105036] [Journal Article/Letter]
2020. "Observations of an Unexpected Meteor Shower Outburst at High Ecliptic Southern Latitude and Its Potential Origin." The Astrophysical Journal 895 (1): L25 [10.3847/2041-8213/ab9181] [Journal Article/Letter]
2020. "A comparative study of radar and optical observations of meteor showers using SAAMER-OS and CAMS." Planetary and Space Science 104936 [10.1016/j.pss.2020.104936] [Journal Article/Letter]
2020. "Meteoroid Bombardment of Lunar Poles." Astrophysical Journal 894 (2): [https://doi.org/10.3847/1538-4357/ab83ee] [Journal Article/Letter]
2020. "Coordinated observations of 8‐ and 6‐hour tides in the mesosphere and lower thermosphere by three meteor radars near 60 o S latitude." Geophysical Research Letters [10.1029/2019gl086629] [Journal Article/Letter]
2019. "On removing showers from the IAU Working List of Meteor Showers." Planetary and Space Science 104821 [10.1016/j.pss.2019.104821] [Journal Article/Letter]
2019. "Quasi Two‐, Three‐, and Six‐Day Planetary‐Scale Wave Oscillations in the Upper Atmosphere Observed by TIMED/SABER Over ~17 Years During 2002–2018." Journal of Geophysical Research: Space Physics 2019JA026918 [10.1029/2019ja026918] [Journal Article/Letter]
2019. "Micrometeoroid Events in LISA Pathfinder." The Astrophysical Journal 883 (1): 53 [10.3847/1538-4357/ab3649] [Journal Article/Letter]
2019. "The Atmospheric Coupling and Dynamics Across the Mesopause (ACaDAMe) Mission." Advances in Space Research [10.1016/j.asr.2019.07.012] [Journal Article/Letter]
2019. "A Decade of Sporadic Meteoroid Mass Distribution Indices in the Southern Hemisphere Derived from SAAMER’s Meteor Observations." The Astronomical Journal 157 (6): 240 [10.3847/1538-3881/ab1b0f] [Journal Article/Letter]
2019. "Structure, Variability, and Mean‐Flow Interactions of the January 2015 Quasi‐Two‐Day Wave at Middle and High Southern Latitudes." Journal of Geophysical Research: Atmospheres 2018JD029728 [10.1029/2018jd029728] [Journal Article/Letter]
2019. "Modeling the Altitude Distribution of Meteor Head Echoes Observed with HPLA Radars: Implications for the Radar Detectability of Meteoroid Populations." The Astronomical Journal 157 (5): 179 [10.3847/1538-3881/ab0ec6] [Journal Article/Letter]
2019. "Meteoroids at the Moon: Orbital Properties, Surface Vaporization, and Impact Ejecta Production." Journal of Geophysical Research: Planets [10.1029/2018je005912] [Journal Article/Letter]
2019. "Impact ejecta environment of an eccentric asteroid: 3200 Phaethon." Planetary and Space Science 165 194-204 [10.1016/j.pss.2018.11.001] [Journal Article/Letter]
2018. "Intraseasonal Variations of Nonmigrating Tides Observed Near the Mesopause." Journal of Geophysical Research: Space Physics 123 (11): 9921-9931 [10.1029/2018ja025709] [Journal Article/Letter]
2018. "Validation of SABER v2.0 Operational Temperature Data with Ground-based Lidars in the Mesosphere-Lower Thermosphere Region (75-105 km)." Journal of Geophysical Research: Atmospheres [10.1029/2018jd028742] [Journal Article/Letter]
2018. "A Comprehensive Model of the Meteoroid Environment around Mercury." The Astrophysical Journal 863 (1): 31 [10.3847/1538-4357/aad051] [Journal Article/Letter]
2018. "Simultaneous optical and dual-frequency radar observations of small mass meteors at Arecibo." Planetary and Space Science [10.1016/j.pss.2018.07.015] [Journal Article/Letter]
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 45 (11): 5798-5803 [10.1029/2018gl077677] [Journal Article/Letter]
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] [Journal Article/Letter]
2018. "Mesospheric front observations by the OH airglow imager carried out at Ferraz Station on King George Island, Antarctic Peninsula, in 2011." Annales Geophysicae 36 (1): 253-264 [10.5194/angeo-36-253-2018] [Journal Article/Letter]
2018. "Progress on laser technology for proposed space-based sodium lidar." Solid State Lasers XXVII: Technology and Devices [10.1117/12.2290471] [Proceedings]
2018. "A survey of southern hemisphere meteor showers." Planetary and Space Science [10.1016/j.pss.2018.02.013] [Journal Article/Letter]
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] [Journal Article/Letter]
2017. "Formation and past evolution of the showers of 96P/Machholz complex." Icarus [10.1016/j.icarus.2017.07.015] [Journal Article/Letter]
2017. "Climatology of semidiurnal lunar and solar tides at mid and high latitudes: interhemispheric comparison." Journal of Geophysical Research: Space Physics [10.1002/2017ja024396] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2017. "Results of the first continuous meteor head echo survey at polar latitudes." Icarus 1-13 [10.1016/j.icarus.2017.06.019] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2017. "Unexpected Climatological Behavior of MLT Gravity Wave Momentum Flux in the Lee of the Southern Andes Hotspot." Geophysical Research Letters [10.1002/2016GL072311] [Journal Article/Letter]
2016. "Sources of Cosmic Dust in the Earth's Atmosphere." Geophysical Research Letters [10.1002/2016gl071697] [Journal Article/Letter]
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] [Journal Article/Letter]
2016. "Solar cycle response and long-term trends in the mesospheric metal layers." JGR- Space Physics [10.1002/2016JA022522] [Journal Article/Letter]
2016. "Measurements of the ionization coefficient of simulated iron micrometeoroids." Geophysical Research Letters 43 (8): 3645-3652 [10.1002/2016gl068854] [Journal Article/Letter]
2016. "Silicon chemistry in the mesosphere and lower thermosphere." J. Geophys. Res. Atmos. 78 (4): 734-745 [10.1002/2015jd024691] [Journal Article/Letter]
2016. "QBO modulation of the mesopause gravity wave momentum flux over Tierra del Fuego." Geophysical Research Letters [10.1002/2016gl068599] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2015. "On the size and velocity distribution of cosmic dust particles entering the 1 atmosphere." Geophys. Res. Lett (42): 6518–6525 [10.1002/2015GL065149] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2015. "Optical observations of meteor head echoes observed with the SAAMER radar ." Planetary and Space Science [doi:10.1016/j.pss.2015.04.018] [Journal Article/Letter]
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] [Journal Article/Letter]
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 [Journal Article/Letter]
2014. "Resolving the strange behaviour of extra-terrestrial potassium in the upper atmosphere." Geophysical Research Letters 41 [10.1002/2014GL060334] [Journal Article/Letter]
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] [Proceedings]
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] [Journal Article/Letter]
2014. "Interferometric meteor head echo observations using the Southern Argentina Agile Meteor Radar." Journal of Geophysical Research - Space Physics 119 [10.1002/2013JA019241] [Journal Article/Letter]
2013. "Diurnal variation in gravity wave activity at low and middle latitudes." Annales Geophysicae 31 2123-2135 [10.5194/angeo-31-2123-2013] [Journal Article/Letter]
2013. "A global model of meteoric sodium." Journal of Geophysical Research - Atmospheres 118 11,442–11,452 [10.1002/jgrd.50870] [Journal Article/Letter]
2013. "A global atmospheric model of meteoric iron." Journal of Geophysical Research - Atmospheres 118 9456–9474 [10.1002/jgrd.50708] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2012. "Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar." Annales Geophysicae 30 945-962 [10.5194/angeo-30-945-2012] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2011. "Dynamical Model for the Zodiacal Cloud and Sporadic Meteors." The Astrophysical Journal 743 (2): 129 [10.1088/0004-637X/743/2/129] [Journal Article/Letter]
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] [Journal Article/Letter]
2011. "Meteoroids: The Smallest Solar System Bodies." NASA/CP—2011–216469 [Report]
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] [Journal Article/Letter]
2010. "Southern Argentina Agile Meteor Radar: Initial assessment of gravity wave momentum fluxes." Journal of Atmospheric Research - Atmospheres 115 D19123 [10.1029/2010JD013891] [Journal Article/Letter]
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] [Journal Article/Letter]
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 [Journal Article/Letter]
2009. "Correction to ‘‘Latitudinal dependence of the variability of the micrometeor altitude distribution’’." Geophysical Research Letters 36 L17101 [10.1029/2009GL039987] [Journal Article/Letter]
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 [Journal Article/Letter]
2009. "Latitudinal dependence of the variability of the micrometeor altitude distribution." Geophysical Research Letters 36 L12105 [10.1029/2009GL038485] [Journal Article/Letter]
2009. "First observation of micrometeoroid differential ablation in the atmosphere." Geophysical Research Letters 36 L06101 [10.1029/2009GL037389] [Journal Article/Letter]
2008. "A chemical model of meteoric ablation." Atmospheric Chemistry and Physics 8 7015-7031 [Journal Article/Letter]
2008. "Observations of D-region Structure and Atmospheric Tides with PFISR during Active Aurora." Journal of Atmospheric and Solar-Terrestrial Physics 71 688-696 [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2006. "Statistical characterization of the meteor distribution at the South Pole using VHF interferometric meteor radar." Radio Science 41 RS4007 [10.1029/2005RS003247,] [Journal Article/Letter]
2005. "The Initial Altitude of the Micrometeor Phenomenon: Comparison between Arecibo radar observations and theory." Journal of Geophysical Research 110 A08307 [10.1029/2005JA011022] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2005. "The meteor flux: It depends how you look." Earth, Moon, and Planets 95 89-100 [10.1007/s11038-005-9001-6] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2004. "Diurnal and seasonal variability of the meteor flux at the South Pole measured with radars." GEOPHYSICAL RESEARCH LETTERS 31 L20807 [10.1029/2004GL021104] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
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] [Journal Article/Letter]
2003. "On the geocentric micrometeor velocity distribution." Journal of Geophysical Research - Space Physics 108 (A6): 1222 [10.1029/2002JA009789] [Journal Article/Letter]
2002. "Tristatic Observations of Meteors Using the 930 MHz EISCAT radar." Journal of Geophysical Research - Space Physics 107 (A11): 1389 [:10.1029/2001JA009205] [Journal Article/Letter]
2002. "The Size Distribution of the Arecibo Interstellar Particles and its Implications." Astrophysical Journal 579 895–904 [Journal Article/Letter]
2002. "Extrasolar Micrometeors Radiating from the Vicinity of the Local Interstellar Bubble." Astrophysical Journal 567 323-341 [Journal Article/Letter]
2001. "The Micrometeoroid Mass Flux into the Upper Atmosphere: Arecibo Results and a Comparison with Prior Estimates." Geophysical Research Letters 28 (10): 1929-193 [Journal Article/Letter]
2001. "Orbital Properties of the Arecibo Micrometeors at Earth Intersection." Icarus 150 205-218 [10.1006/icar.2000.6575] [Journal Article/Letter]
2000. "Doppler Studies of Near-Antapex UHF Radar Micrometeors." Icarus 143 347-353 [0.1006/icar.1999.6257] [Journal Article/Letter]
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 [Journal Article/Letter]