Analysis of Martian ionosphere and solar wind electron gas data from the planar retarding potential analyzer on the Viking spacecraft

Details Analysis of Martian ionosphere and solar wind electron gas data from the planar retarding potential analyzer on the Viking spacecraft Analysis of Martian ionosphere and solar wind electron gas data from the planar retarding potential analyzer on the Viking spacecraft

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8559m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 1, 1987, p. 8559-8569.

Physics

15

Electron Gas, Mars Atmosphere, Planetary Ionospheres, Solar Planetary Interactions, Solar Wind, Viking Spacecraft, Photoelectrons, Solar Electrons, Volt-Ampere Characteristics, Mars, Ionosphere, Analysis, Solar Wind, Electrons, Viking Missions, Gases, Rpa Instrument, Spacecraft Observations, Current, Parameters, Temperature, Density, Technique, Equipment, Diagrams, Procedure, Calculations

Scientific paper

Approximate expressions for the electron current collected by a planar retarding potential analyzer (RPA) mounted on a moving, conducting, charged spacecraft are derived. They are utilized for the analysis of electron current data obtained by the RPAs on the Viking spacecraft in the ionosphere of Mars and in the disturbed and undisturbed solar wind near this planet. It is shown that contamination currents by photoelectrons emitted from the spacecraft can be distinguished and removed from the signal. Parameters deduced from the analysis of RPA electron sampling data are the multicomponent electron temperatures, the number densities, and the spacecraft potential.

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