Jeffrey Klenzing

Jeffrey Klenzing

  • RESEARCH AST, FIELDS AND PARTICLES
  • 301.286.6172
  • 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

    petitSat

    Dr. Klenzing is the PI of the Plasma Enhancements in The Ionosphere-Thermosphere Satellite (petitSat), a 6U CubeSat mission designed to examine the link between plasma density enhancements observed in the topside by satellites and waves such as MSTIDs observed by ground-based imagers.  petitSat will carry two instruments: the Neutral Mass Spectrometer (NMS) provided by GSFC (PI: Sarah Jones) and the Gridded Retarding Ion Drift Sensor (GRIDS) provided by Utah State University (PI: Ryan Davidson).  petitSat is scheduled to be launched in early 2021.

    ICON

    Dr. Klenzing serves as the Mission Scientist for the Ionospheric CONnection (ICON) explorer mission, led by UC Berkeley. The goal of the ICON mission is to understand the tug-of-war between Earth’s atmosphere and the space environment. In the “no man’s land” of the ionosphere, at altitudes above 50 miles, a continuous struggle between forcing by both the Sun and Earth’s weather systems drives extreme and unpredicted variability. ICON will investigate the forces at play in the near-space environment.

    AIM

    Dr. Klenzing serves as the Deputy Mission Scientist for the Aeronomy of Ice in the Mesosphere (AIM) explorer mission, led by Hampton University.  AIM is exploring Polar Mesospheric Clouds (PMCs), also called noctilucent clouds, to find out why they form and why they are changing.

    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 and organizer of special issue of Annales Geophysicae - “C/NOFS results and Equatorial Ionospheric Dynamics” (2013-2014)

    Conferences and Workshops
    Organizing Committee - C/NOFS and Equatorial Dynamics Technical Interchange, 2013
    Organizing Committee - C/NOFS Science Workshop, 2010

    Awards

    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

    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]

    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]

    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]

    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]

    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]

    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., 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]

    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]

    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., 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., 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]

    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]

    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, 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]

    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]

    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]

    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]

    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]

    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]

    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]

    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.

    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.

    Selected Publications

    Refereed

    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]

    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]

    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]

    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]

    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]

    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., 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]

    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]

    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., 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., 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]

    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]

    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, 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]

    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]

    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]

    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]

    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]

    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]

    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]

    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

                                                                                                                                                                                            
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