A comparison between the earth's and Mars' bow shocks detected by the PHOBOS Plasma-Wave System

Details A comparison between the earth's and Mars' bow shocks detected by the PHOBOS Plasma-Wave System A comparison between the earth's and Mars' bow shocks detected by the PHOBOS Plasma-Wave System

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39...99t&link_type=abstract

(Colloquium on Phobos-Mars Mission, Paris, France, Oct. 23-27, 1989, Proceedings. A91-29558 11-91) Planetary and Space Science (

Astronomy and Astrophysics

Astronomy

10

Bow Waves, Energy Spectra, Mars Probes, Phobos, Plasma Waves, Shock Waves, Electric Fields, Solar Wind, Spaceborne Astronomy, Planets, Comparisons, Earth, Mars, Bow Shock, Spacecraft Observations, Phobos Missions, Pws Instrument, Plasma, Electric Field, Amplitude, Structure, Features, Description, Diagrams, Magnetosphere, Intensity, Magnetosheath, Magnetopause, Trajectory, Density, Spectra, Frequencies

Scientific paper

Among the scientific instruments on the Phobos spacecraft, one was expected to study the plasma and wave phenomena in the Martian environment: the Plasma-Wave System (PWS). Here the PWS plasma and electric-field spectrum measurements during two Martian bow shock crossing by Phobos 2 are reported. One is located near the subsolar point and the other near the dusk terminator. A comparison is also made with the earth's shock crossed by Phobos 1. As at earth, three main regions were identified: the upstream region, the shock transition region, and the downstream region. A shock foot boundary is often observed in front of the bow shock. This foot is known to be associated with gyrating ions reflected from the shock. Electric-field spectra are presented and tentatively interpreted. The dynamic spectrograms shown in this report differ from the ones published previously, for the fact that the filter channels are not sampled at the same time has been taken into account.

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