PRESENT POSITION:

Astrophysicist
Planetary Atmospheres Branch
NASA/Goddard Space Flight Center

EDUCATION:

1963 - B.S., Physics, Manhattan College, New York, New York
1965 - M.S., Physics, Pennsylvania State University, University Park, PA
1968 - Ph.D., Physics, Pennsylvania State University, University Park, PA

RESEARCH INTERESTS:

Terrestrial hermosphere/Ionosphere/magnetosphere; physics; radio wave propagation, ion/neutral chemistry, meteoritics and meteoric ionization, planetary ionospheres, Space Shuttle and Space Station Environments, Ion Spectrometry, Lightning.

EXPERIENCE:

Summer 1962 -- Summer Trainee, Atomic Energy Commission, New York Operations Office
Summer 1963 -- Physicist, Naval Ordnance Laboratory, White Oak, Maryland
1963-1965 -- Research Assistantship, Ionosphere Research Lab., Pennsylvania State University

SPECIAL EXPERIENCE:

1995-1997 -- Assisted R. Carovillano in NASA's Magnetosphere Physics program.
1994-1996 -- Member NASA ITM MOWG
1993-1994 -- Deputy Project Scientist on TIMED
1992-1994 -- Coinvestigator on TIMED TWINNIE Experiment
1992-1993 -- Coinvestigator on Pioneer Venus Orbital Ion Mass Spectrometer Team.
1991-1992 -- Member of Source Evaluation Board for NOAA Space Environment Monitoring System.
1991 -- Member of NASA Space Physics Suborbital Science review panel.
1990 -- Chairman of NASA Space Physics Guest Investigator Program review panel.
1990 -- Chairman of Cassini Experiment review panel, and member of NASA's categorization panel for investigator selection on this mission.
1990-1998 -- Coinvestigator (with responsibility for the ion measurements) on the Contamination Experiment team for the Mid course Space experiment (MSX). The APL contamination monitoring package is to be flown on a strategic Defence Initiative satellite mission (1994 launch).
1990-1992 -- PI responsibility for the Atmosphere Explorer satellites' ion mass spectrometer data used in NASA's Space Physics Guest Investigator Program.
1988-1992 -- Cochairman of Pioneer Venus Guest Investigator Review Panel.
1988 -- Member of EOS proposal evaluation panel.
1988 -- Member of CRAF science review panel.
1988-1990 -- Coinvestigator on Neutral Gas Ion Mass Spectrometer experiment team for the Comet Rendezvous Asteroid Flyby (CRAF) mission.
1987-1990 -- Member of Space Station Plasma Interaction Effects Working Group.
1987 -- Member of science definition team for the Mars Aeronomy Orbiter mission.
1984-1987 -- Principal Scientist for ion spectrometer flown as part of the U. Iowa's Plasma Diagnostic Package that was carried on two Space Shuttle missions: STS-3 and Spacelab 2 (STS-51F).
1983-1984 One year half time detail followed by one year full time detail at NASA Headquarters in Planetary Atmosphere Program of the Planetary Division under H. C. Brinton. Executive secretary of the Planetary Atmospheres Management Operations Working Group (MOWG). Member of Pioneer Venus Guest Investigator panel.
1982 -- Member of CRESS science review and categorization panel.
1978-1979 -- Half time detail at NASA Headquarters in Planetary Atmosphere Program of the Planetary Division under R. Murphy. Was responsible for developing and setting up the charter for the program's MOWG. Served on numerous GSFC committees and student mentor programs. Typically referee or critique more than 6 scientific journal submissions/NASA proposals per year.

PROFESSIONAL SOCIETY MEMBERSHIPS: American Geophysical Union

SELECTED PUBLICATIONS:

1. "Do Meteor Showers Significantly Perturb the Ionosphere?", J. Atmos. Solar-Terr. Phys., in Press, 1998.
2. "Comparison of Measured High Latitude F-Region Ion Composition Climatology Variability with Models", J. M. Grebowsky, R. E. Erlandson, J. J. Sojka, R. W. Schunk, and D. Bilitza, Adv. Space Res., in Press, 1998.
3. "Evidence for Lightning on Venus", J. M. Grebowsky, R. J. Strangeway and D. M. Hunten, Chapter in Venus II, 125-160, U. Arizona Press, 1997.
4. "MSX Contamination Experiment Ion Mass Spectrometer observations During Early Operations", R. E. Erlandson, M. Boies, O. M. Uy, J. M. Grebowsky, and J. T. Coulson, SPIE, 2864, 202-207, 1996.
5. "Pioneer Venus Orbiter Contributions to a Revised Venus Reference Ionosphere", L. H. Brace, J. M. Grebowsky and A. J. Kliore, Adv. Space Res., 19, 1203-1212, 1996.
6. "A comparison of Ionization Densities Determined from Spacecraft and Incoherent Radar Back scatter Data", N. J. Miller, J. M. Grebowsky, W. R. Hoegy, and K. K. Mahajan, J. Atmos. Terr. Phys., 58, 1735-1740, 1996.
7. "Hydrogen and Deuterium in the Thermosphere of Venus: Solar Cycle Variations and Escape", R. E. Hartle, T. M. Donahue, J. M. Grebowsky and H. G. Mayr, J. Geophys. Res., 101, 4525-4538, 1996.
8. "On Removing Molecular Ions from Venus (and, by implication, Mars)", J.G. Luhmann, W.T. Kasprzak and J.M. Grebowsky, J. Geophys. Res., 100, 14515-14521, 1995.
9. "A New Look at Venus' Thermosphere H Distribution", J.M. Grebowsky, W.T. Kasprzak, R.E. Hartle and T.M. Donahue, Adv. Space Res., 17, (11)191-(11)195, 1995.
10. "Morphology of O++ Ions and Their Maintenance in the Nightside Venus Ionosphere," S. Ghosh, K.K. Mahajan, J.M. Grebowsky, and N. Nath, J. Geophys. Res., 100, 23983-23992, 1995.