Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981utd..repts....h&link_type=abstract
Final Technical Report, 1 Mar. 1979 - 31 Dec. 1980 Texas Univ., Dallas. Center for Space Sciences.
Physics
Electromagnetic Fields, Electron Flux Density, Ionospheric Electron Density, Mars Atmosphere, Solar Wind Velocity, Bow Waves, Energy Spectra, Planetary Ionospheres, Shock Waves, Viking Lander Spacecraft, Whistlers
Scientific paper
Measurements of the martian ionosphere performed by Viking Retarding Potential Analyzer (RPA) are reported. Viking RPA measurements of low energy electron fluxes out to 16,000 km above the Mars surface are discussed including both energy spectra and periods of continuous monitoring of the total flux above 15 ev. The mean electron current at energies greater than ev increases montonically by nearly two orders of magnitude from about 9000 km down to 700 km, but no clear signature of the bow shock is seen. The total wave power in the 2 sec measurement intervals for this current does, however, show a broad peak near 1700 km altitude. These variations in the low energy electron fluxes are related to whistler mode oscillations in the solar wind plasma. It is concluded that there may be a highly turbulent shock structure that masks a clear signature of the bow shock in the time averaged data.
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