Sciences and Exploration Directorate

Jeff Klenzing

(RESEARCH AST, FIELDS AND PARTICLES)

 jeff.klenzing@nasa.gov

 301.286.6172

Org Code: 675

NASA/GSFC
Mail Code: 675
Greenbelt, MD 20771

Employer: NASA

Brief Bio


 Dr. Klenzing’s research interests include ionospheric electrodynamics, Ionosphere-Thermosphere coupling, and measurement techniques for thermal plasmas and winds. He completed his dissertation, “Effects of non-ideal biased grids on drifting particle distribution functions,” at the University of Texas at Dallas under the supervision of Dr. Gregory Earle in 2008. He moved to GSFC in 2009 as a NASA Postdoctoral Fellow and became a research astrophysicist in 2012.

Current Projects


Driving the Ionosphere from Below: Effects of Planetary Waves and Ion-Neutral Coupling on Low-latitude Plasma Density Irregularities

Earth's Ionosphere

Dr. Klenzing is leading a Living With a Star project to analyze the effects of multi-day planetary waves on the growth rates of equatorial plasma bubbles, regions of dramatically decreased plasma in the low-latitude ionosphere. The climatology of the bubbles is well understood, but the weather (day-to-day variability) is not. To better understand this, NASA is partnering with the Naval Research Laboratory to examine the predicted variability in the instability growth rates using coupled state-of-the-art models to determine how assimilated weather patterns from the the lower thermosphere can drive the ionospheric instabilities hundreds of km above. The mesoscale (hundreds of km) density structures break down into turbulent structures meters in scale that can have a detrimental effect on communication and navigation signals.

This project supports Goddard 2040 Strategic Vision Vector 4 (Enhance Space Weather Knowledge and Applications). 


Space Precipitation Impacts

Earth's Thermosphere

Dr. Klenzing serves as the Impacts subgroup lead for the Space Precipitation Impacts group at Goddard Space Flight Center.


Resolving the Generation Mechanisms and Electrodynamical Effects of Medium Scale Traveling Ionospheric Disturbances (MSTIDs)

Space Weather

Group co-lead for the International Space Science Institute team to identify the open questions regarding and paths forward to understand Traveling Ionospheric Disturbances. These mesoscale (hundreds of km) ionospheric plasma structures can be produced by geomagnetic storm inputs into the high-latitude atmosphere, electromagnetic coupling between the E- and F-region ionosphere, and tropospheric storms (hurricanes, thunderstorms, etc) or other natural hazards (volcanos, tsunamis) driving from the troposphere via acoustic waves. These structures have a detrimental effect on radio wave propagation through the ionosphere. This is a group effort including researchers across the US, Europe, and Asia to plan future observational campaigns, improvements to physics-based models, and the observational requirements for future space-based and ground-based missions.

This project supports Goddard 2040 Strategic Vision Vector 1 (Advance Multidisciplinary Space Science) and Vector 4 (Enhance Space Weather Knowledge and Applications).

https://teams.issibern.ch/ionosphericdisturbances/


Open Source Software

Dr. Klenzing is an active contributor to multiple open source community software projects, including pysat, sami2py, and growin.

Positions/Employment


Research Astrophysicist

NASA GSFC - Greenbelt, MD

April 2012 - Present


Postdoctoral Fellow

NASA Postdoctoral Program - Greenbelt, MD

May 2009 - April 2012

Education


Ph.D., Physics, The University of Texas at Dallas, 2008
M.S., Physics, The University of Texas at Dallas, 2005
B.S., Physics, The University of Texas at Dallas, 2004

Professional Societies


American Geophysical Union

2004 - Present

Professional Service


Editorial Activities

  • Guest editor of special issue of Earth, Planets, Space - “16th International Symposium on Equatorial Aeronomy (ISEA-16), 2022” (2022-2023)
  • Guest editor of special issue of Journal of Space Weather and Space Climate - “Ionospheric plasma irregularities and their impact on radio systems” (2021-2022)
  • Guest editor and organizer of special issue of Annales Geophysicae - “C/NOFS results and Equatorial Ionospheric Dynamics” (2013-2014)


Conferences and Workshops

  • Science Organizing Committee - International Symposium on Equatorial Aeronomy, 2022
  • Organizing Committee - Geospace Discovery Science Workshop, 2021
  • Organizing Committee - C/NOFS and Equatorial Dynamics Technical Interchange, 2013
  • Organizing Committee - C/NOFS Science Workshop, 2010

Awards


NASA, Group Achievement Award for the Ionospheric CONnection Explorer team, 2021

NRL, Alan Berman Research Publication Award, 2016

NASA, Group Achievement Award for the Firefly CubeSat team, 2014

NASA, Group Achievement Award for the FASTSAT Instrument development team, 2011

NASA, Postdoctoral Program Fellow, 2009-2012

Selected Publications


Refereed

Halford, A. J., C. M. Bard, A. G. Burrell, et al. R. M. McGranaghan, L. B. Wilson, M. Jones, C. Dong, L. Wang, T. I. Pulkkinen, N. Turner, M. W. Liemohn, and J. Klenzing. 2023. The importance of recruitment and retention in Heliophysics: it’s not just a pipeline problem Frontiers in Astronomy and Space Sciences 10 [10.3389/fspas.2023.1216449]

Rowland, D., A. Halford, J. Klenzing, et al. R. Pfaff, D. Oliveira, L. Paxton, D. Turner, O. Verkhoglyadova, and S. Zou. 2023. Cross-Scale and Cross-Regime Coupling in the ITM: Studying Weather, not just Climate, in the Middle and Upper Atmosphere Bulletin of the AAS 55 (3): [10.3847/25c2cfeb.041166a2]

Liu, G., D. E. Rowland, Q. Gan, et al. H. Liu, J. H. Klenzing, S. L. England, and R. W. Eastes. 2023. Thermospheric temperature and ∑O/N <sub>2</sub> variations as observed by GOLD and compared to MSIS and WACCM‐X simulations during 2019‐2020 at deep solar minimum Journal of Geophysical Research: Space Physics [10.1029/2023ja031560]

Stoneback, R. A., A. G. Burrell, J. Klenzing, and J. Smith. 2023. The pysat ecosystem Frontiers in Astronomy and Space Sciences 10 [10.3389/fspas.2023.1119775]

Klenzing, J., A. J. Halford, A. Kellerman, and B. Thompson. 2023. Using Application Usability Levels to support tracking the health of Heliophysics Frontiers in Astronomy and Space Sciences 10 [10.3389/fspas.2023.1144053]

Halford, A. J., A. G. Burrell, M. W. Liemohn, et al. M. Jones, A. Maute, T. I. Pulkkinen, C. M. Bard, R. M. McGranaghan, L. B. Wilson, R. C. Allen, C. Dong, S. K. Vines, L. Wang, N. Turner, K. Garcia-Sage, K. Mandt, and J. Klenzing. 2023. Cultivating a culture of inclusivity in heliophysics Frontiers in Physics 11 [10.3389/fphy.2023.1061683]

Klenzing, J., A. J. Halford, G. Liu, et al. J. M. Smith, Y. Zhang, K. Zawdie, N. Maruyama, R. Pfaff, and R. L. Bishop. 2023. A system science perspective of the drivers of equatorial plasma bubbles Frontiers in Astronomy and Space Sciences 9 [10.3389/fspas.2022.1064150]

Klenzing, J., J. M. Smith, A. J. Halford, J. D. Huba, and A. G. Burrell. 2022. sami2py—Overview and applications Frontiers in Astronomy and Space Sciences 9 [10.3389/fspas.2022.1066480]

Le, G., D. J. Knipp, L. Rastätter, et al. G. Lu, D. S. Ozturk, J. A. Slavin, A. Maute, J. Klenzing, S. Zou, J. R. Espley, M. Purucker, M. Akhavan-Tafti, G. K. Poh, and Z. Wang. 2022. Next generation magnetic field measurements from low-earth orbit satellites enable enhanced space weather operations Frontiers in Astronomy and Space Sciences 9 [10.3389/fspas.2022.1076892]

Zawdie, K., A. Belehaki, M. Burleigh, et al. M.-Y. Chou, M. S. Dhadly, K. Greer, A. J. Halford, D. Hickey, P. Inchin, S. R. Kaeppler, J. Klenzing, V. L. Narayanan, F. Sassi, M. Sivakandan, J. M. Smith, N. Zabotin, M. D. Zettergren, and S.-R. Zhang. 2022. Impacts of acoustic and gravity waves on the ionosphere Frontiers in Astronomy and Space Sciences 9 [10.3389/fspas.2022.1064152]

Smith, J. M., and J. Klenzing. 2022. Growin: Modeling ionospheric instability growth rates Journal of Space Weather and Space Climate 12 26 [10.1051/swsc/2022021]

Rowland, D., M. Collier, J. Keller, et al. R. Pfaff, J. Klenzing, J. McLain, J. Clemmons, and J. Hecht. 2022. Imaging Low-Energy Ion Outflow in the Auroral Zone Frontiers in Astronomy and Space Sciences 9 [10.3389/fspas.2022.809367]

Pfaff, R., E. Kudeki, H. Freudenreich, et al. D. Rowland, M. Larsen, and J. Klenzing. 2022. Dual sounding rocket and C/NOFS satellite observations of DC electric fields and plasma density in the equatorial E and F region ionosphere at sunset Journal of Geophysical Research: Space Physics [10.1029/2021ja030191]

Pfaff, R., P. Uribe, R. Fourre, et al. J. Kujawski, N. Maynard, M. Acuña, D. Rowland, H. Freudenreich, K. Bromund, S. Martin, C. Liebrecht, R. Kramer, F. Hunsaker, R. Holzworth, M. McCarthy, W. Farrell, J. Klenzing, G. Le, A. Jacobson, J. Houser, C. Steigies, and J.-J. Berthelier. 2021. The Vector Electric Field Investigation (VEFI) on the C/NOFS Satellite Space Science Reviews 217 (8): 85 [10.1007/s11214-021-00859-y]

Liu, G., S. L. England, C. S. Lin, et al. N. M. Pedatella, J. H. Klenzing, C. R. Englert, B. J. Harding, T. J. Immel, and D. E. Rowland. 2021. Evaluation of Atmospheric 3‐Day Waves as a Source of Day‐to‐Day Variation of the Ionospheric Longitudinal Structure Geophysical Research Letters 48 (15): [10.1029/2021gl094877]

Verkhoglyadova, O. P., C. D. Bussy‐Virat, A. Caspi, et al. D. R. Jackson, V. Kalegaev, J. Klenzing, J. Nieves‐Chinchilla, and A. Vourlidas. 2021. Addressing Gaps in Space Weather Operations and Understanding With Small Satellites Space Weather 19 (3): [10.1029/2020sw002566]

Martinis, C., R. Daniell, R. Eastes, et al. J. Norrell, J. Smith, J. Klenzing, S. Solomon, and A. Burns. 2021. Longitudinal Variation of Postsunset Plasma Depletions From the Global‐Scale Observations of the Limb and Disk (GOLD) Mission Journal of Geophysical Research: Space Physics 126 (2): [10.1029/2020ja028510]

Pfaff, R., M. Larsen, T. Abe, et al. H. Habu, J. Clemmons, H. Freudenreich, D. Rowland, T. Bullett, M. Yamamoto, S. Watanabe, Y. Kakinami, T. Yokoyama, J. Mabie, J. Klenzing, R. Bishop, R. Walterscheid, M. Yamamoto, Y. Yamazaki, N. Murphy, and V. Angelopoulos. 2020. Daytime Dynamo Electrodynamics With Spiral Currents Driven by Strong Winds Revealed by Vapor Trails and Sounding Rocket Probes Geophysical Research Letters 47 (15): [10.1029/2020gl088803]

Klenzing, J., R. Davidson, S. Jones, et al. C. Martinis, K. Zawdie, G. Earle, J. Smith, A. Halford, S. Noel, N. Paschalidis, R. Pfaff, and E. Robertson. 2020. The petitSat Mission – Science Goals and Instrumentation Advances in Space Research 66 (1): 107-115 [10.1016/j.asr.2019.12.013]

Halford, A. J., A. C. Kellerman, K. Garcia-Sage, et al. J. Klenzing, B. A. Carter, R. M. McGranaghan, T. Guild, C. Cid, C. J. Henney, N. Y. Ganushkina, A. G. Burrell, M. Terkildsen, D. T. Welling, S. A. Murray, K. Leka, J. P. McCollough, B. J. Thompson, A. Pulkkinen, S. F. Fung, S. Bingham, M. M. Bisi, M. W. Liemohn, B. M. Walsh, and S. K. Morley. 2019. Application Usability Levels: A Framework for Tracking Project Product Progress J. Space Weather Space Clim. 9 A34 [https://doi.org/10.1051/swsc/2019030]

Burrell, A. G., A. Halford, J. Klenzing, et al. R. A. Stoneback, S. K. Morley, A. M. Annex, K. M. Laundal, A. C. Kellerman, D. Stansby, and J. Ma. 2018. Snakes on a Spaceship—An Overview of Python in Heliophysics Journal of Geophysical Research: Space Physics 123 (12): 2018JA025877 [10.1029/2018ja025877]

Stoneback, R. A., A. G. Burrell, J. Klenzing, and M. D. Depew. 2018. PYSAT: Python Satellite Data Analysis Toolkit Journal of Geophysical Research: Space Physics 123 5271–5283 [10.1029/2018ja025297]

Collier, M. R., D. Chornay, J. Clemmons, et al. J. Keller, J. Klenzing, J. Kujawski, J. McLain, R. Pfaff, D. Rowland, and M. Zettergren. 2015. VISIONS remote observations of a spatially-structured filamentary source of energetic neutral atoms near the polar cap boundary during an auroral substorm Advances in Space Research 56 (10): 2097-2105 [10.1016/j.asr.2015.08.010]

Drob, D. P., J. T. Emmert, J. W. Meriwether, et al. J. J. Makela, E. Doornbos, M. Conde, G. Hernandez, J. Noto, K. A. Zawdie, S. E. McDonald, J. D. Huba, and J. H. Klenzing. 2015. An update to the Horizontal Wind Model (HWM): The quiet time thermosphere Earth and Space Science 2 (7): 301-319 [10.1002/2014ea000089]

Kelley, M. C., F. S. Rodrigues, R. F. Pfaff, and J. Klenzing. 2014. Observations of the generation of eastward equatorial electric fields near dawn ANNALES GEOPHYSICAE 32 1169-1175 [10.5194/angeo-32-1169-2014]

Klenzing, J., O. de La Beaujardiere, L. C. Gentile, et al. J. Retterer, F. S. Rodrigues, and R. A. Stoneback. 2014. C/NOFS results and equatorial ionospheric dynamics Preface ANNALES GEOPHYSICAE 32 1303-1303 [10.5194/angeo-32-1303-2014]

Klenzing, J. H., A. G. Burrell, R. A. Heelis, et al. J. Huba, R. F. Pfaff, and F. Simoes. 2013. Exploring the role of ionospheric drivers during the extreme solar minimum of 2008 Annales Geophysicae 31 2147-2156 [10.5194/angeo-31-2147-2013]

Simoes, F., R. F. Pfaff, H. T. Freudenreich, et al. J. H. Klenzing, D. E. Rowland, K. Bromund, E. L. Kepko, G. Le, M. C. Liebrecht, S. C. Martin, and P. Uribe. 2013. Equatorial ionosphere semiannual oscillation investigated from Schumann resonance measurements on board the C/NOFS satellite Journal of Geophysical Research (Atmospheres) 118 12,045-12,051 [10.1002/jgrd.50797]

Klenzing, J. H., F. Simoes, S. Ivanov, et al. D. Bilitza, R. A. Heelis, and D. E. Rowland. 2013. Performance of the IRI-2007 model for equatorial topside ion density in the African sector for low and extremely low solar activity Advances in Space Research 52 1780-1790 [10.1016/j.asr.2012.09.030]

Ngwira, C., J. H. Klenzing, J. Olwendo, et al. F. M. D'ujanga, R. Stoneback, and P. Baki. 2013. A study of intense ionospheric scintillation observed during a quiet day in the East African low latitude region Radio Science 48 [10.1002/rds.20045]

Haaser, R. A., R. Davidson, R. A. Heelis, et al. G. D. Earle, S. Venkatraman, and J. H. Klenzing. 2013. Storm time meridional wind perturbations in the equatorial upper thermosphere Journal of Geophysical Research (Space Physics) 118 2756-2764 [10.1002/jgra.50299]

Ngwira, C. M., J. Klenzing, J. Olwendo, et al. F. M. D'ujanga, R. Stoneback, and P. Baki. 2013. A study of intense ionospheric scintillation observed during a quiet day in the East African low-latitude region RADIO SCIENCE 48 396-405 [10.1002/rds.20045]

Simoes, F., R. F. Pfaff, M. Hamelin, et al. J. H. Klenzing, H. T. Freudenreich, C. Beghin, J.-J. Berthelier, K. Bromund, R. Grard, J.-P. Lebreton, S. C. Martin, D. E. Rowland, D. Sentman, Y. Takahashi, and Y. Yair. 2012. Using Schumann Resonance measurements for constraining the water abundance on the giant planets - implications for the Solar System formation The Astrophysical Journal 750:85 [10.1088/0004-637X/750/1/85]

Aveiro, H. C., D. L. Hysell, R. G. Caton, et al. K. M. Groves, J. H. Klenzing, R. F. Pfaff, R. Stoneback, and R. A. Heelis. 2012. Three-dimensional numerical simulations of equatorial spread F: Results and observations in the Pacific sector Journal of Geophysical Research (Space Physics) 117 A03325 [10.1029/2011JA017077]

Simoes, F., R. F. Pfaff, J.-J. Berthelier, and J. H. Klenzing. 2012. A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms Space Science Reviews 168 551-593 [10.1007/s11214-011-9854-0]

Simoes, F., J. H. Klenzing, S. Ivanov, et al. R. F. Pfaff, H. T. Freudenreich, D. Bilitza, D. E. Rowland, K. Bromund, M. C. Liebrecht, S. C. Martin, P. W. Schuck, P. Uribe, and T. Yokoyama. 2012. Detection of Ionospheric Alfven Resonator signatures in the equatorial ionosphere Journal of Geophysical Research (Space Physics) 117 [10.1029/2012JA017709]

Klenzing, J. H., and D. E. Rowland. 2012. The fixed-bias Langmuir probe on the C/NOFS satellite: calibration and validation Reviews of Scientific Instruments 83 114501 [10.1063/1.4766333]

Haaser, R. A., G. D. Earle, R. A. Heelis, et al. J. Klenzing, R. Stoneback, W. R. Coley, and A. G. Burrell. 2012. Characteristics of low-latitude ionospheric depletions and enhancements during solar minimum Journal of Geophysical Research (Space Physics) 117 [10305-10.1029/2012JA017814]

Klenzing, J. H., F. Simoes, S. Ivanov, et al. R. A. Heelis, D. Bilitza, R. Pfaff, and D. Rowland. 2011. Topside equatorial ionospheric density and composition during and after extreme solar minimum Journal of Geophysical Research (Space Physics) 116 [12330-10.1029/2011JA017213]

Klenzing, J. H., D. E. Rowland, R. F. Pfaff, et al. G. Le, H. T. Freudenreich, R. A. Haaser, A. G. Burrell, R. A. Stoneback, W. R. Coley, and R. A. Heelis. 2011. Observations of low-latitude plasma density enhancements and their associated plasma drifts Journal of Geophysical Research (Space Physics) 116 A09324 [10.1029/2011JA016711]

Rowland, D. E., M. R. Collier, J. B. Sigwarth, et al. S. L. Jones, J. K. Hill, R. Benson, M. Choi, D. Chornay, J. Cooper, S. Feng, N. Gill, C. Goodloe, L. Han, H. Hancock, F. Hunsaker, N. Jones, J. W. Keller, J. Klenzing, I. Kleyner, T. Moore, K. Ogilvie, R. Pfaff, T. Price, J. Roman, M. Rodruiguez, P. Rozmarynowski, M. Saulino, S. Sheikh, K. Simms, A. Yew, E. Young, J. Kujawski, M. Boudreaux, J. Casas, D. Myre, and B. Smith. 2011. Science of opportunity: Heliophysics on the FASTSAT mission and STP-S26 2011 Aerospace Conference [10.1109/aero.2011.5747235]

Haaser, R. A., G. D. Earle, R. A. Heelis, W. R. Coley, and J. H. Klenzing. 2010. Low‐latitude measurements of neutral thermospheric helium dominance near 400 km during extreme solar minimum Journal of Geophysical Research (Space Physics) 115 A11318 [10.1029/2010JA015325]

Davidson, R. L., G. D. Earle, J. H. Klenzing, and R. A. Heelis. 2010. A numerical study of geometry dependent errors in velocity, temperature, and density measurements from single grid planar retarding potential analyzers Physics of Plasmas 17 082901 [10.1063/1.3457931]

Pfaff, R., D. Rowland, H. Freudenreich, et al. K. Bromund, G. Le, M. Acuna, J. Klenzing, C. Liebrecht, S. Martin, W. J. Burke, N. C. Maynard, D. E. Hunton, P. A. Roddy, J. O. Ballenthin, and G. R. Wilson. 2010. Observations of DC electric fields in the low-latitude ionosphere and their variations with local time, longitude, and plasma density during extreme solar minimum Journal of Geophysical Research (Space Physics) 115 [12324-10.1029/2010JA016023]

Klenzing, J. H., G. D. Earle, R. A. Heelis, and W. R. Coley. 2009. A statistical analysis of systematic errors in temperature and ram velocity estimates from satellite-borne retarding potential analyzers Physics of Plasmas 16 052901 [10.1063/1.3125311]

Klenzing, J. H., G. D. Earle, and R. A. Heelis. 2008. Errors in ram velocity and temperature measurements inferred from satellite-borne retarding potential analyzers Physics of Plasmas 15 062905 [10.1063/1.2936270]

Earle, G. D., J. H. Klenzing, P. A. Roddy, et al. W. A. Macaulay, M. D. Perdue, and E. L. Patrick. 2007. A new satellite-borne neutral wind instrument for thermospheric diagnostics Review of Scientific Instruments 78 114501 [10.1063/1.2813343]

Non-Refereed

Klenzing, J. H., I. Seker, R. F. Pfaff, et al. D. E. Rowland, S. F. Fung, and J. D. Mathews. 2011. Multi-instrument observations of an MSTID over Arecibo Observatory General Assembly and Scientific Symposium; 2011 XXXth URSI; AUG 2011 1-4