Solar wind measurements near Mars and their implication in the Red Planet environment

摘要: Abstract The Phobos 2 spacecraft was operational around Mars for almost two months. From 29 January to 27 March 1989, the Martian bow shock crossed at least 200 times and upstream regions extensively probed. solar wind density velocity deduced from a.c. electric-field measurements performed with PWS plasma wave experiment are compared those of ASPERA 3-D composition experiment. A reasonably good agreement is found between 12 min averages numbers derived (considering poor precision instruments): they differ by most a factor four. decrease when flow speed increases, in stream structure wind, which results heliomagnetic latitude dependencies parameters. ram pressure, essential study wind-Mars interaction, also estimated: absence clear relationship this dynamic pressure location confirmed. observations during very high activity do not support hypothesis that possesses significant intrinsic magnetic field.