Solar wind deceleration upstream of the Martian bow shock: possible influence of dense corona of neutral gas.

Details Solar wind deceleration upstream of the Martian bow shock: possible influence of dense corona of neutral gas. Solar wind deceleration upstream of the Martian bow shock: possible influence of dense corona of neutral gas.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996kosis..34..604k&link_type=abstract

Kosmicheskie Issledovaniia, Tom 34, No. 6, p. 604 - 612

Physics

Mars Magnetosphere: Solar Wind, Mars Atmosphere

Scientific paper

A deceleration of the solar wind upstream of the Martian bow shock near the terminator plane is analyzed using data of the TAUS spectrometer on board the Phobos 2 spacecraft. The value of the velocity decrease upstream of the Martian bow shock for ascending orbit parts is inversely proportional to the density of the undisturbed solar wind, but practically, there is no such dependence for descending orbit segments, which are, in average, attributed to crossings of the quasi-perpendicular shock wave. This fact can be explained by the existence of an extended corona of neutral particles near Mars that causes the solar wind deceleration upstream of the shock wave; however, in the case of crossing quasi-perpendicular shock wave, an important role is played by the strong mass loading of the solar wind by reflected protons. The obtained dependence of the velocity decrease upstream of the bow shock on the density of the undisturbed solar wind allows to estimate the density of neutral particles in the Martian corona.

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