Observations of the nightside ionosphere of Mars by the Mars Express Radio Science Experiment (MaRS)

摘要: [1] The vertical structure of the nightside ionosphere Mars and its dependence on solar zenith angle are currently poorly determined, as is importance two key sources plasma, electron precipitation transport dayside plasma. We examined 37 density profiles at angles 101°–123° obtained by Express Radio Science Experiment (MaRS) between 18 August 1 October 2005. In general, activity was low during this period, although several energetic particle events did occur. The results show that (1) trends in peak altitude with consistent plasma an important source up to 115°, but not higher; (2) altitudes around 150 km observed larger (>115°) simulated production precipitation; (3) 90 km, accepted models. Solar can be main These challenge current models ionosphere, including their implications for sources. total content correlated density, requiring explanation. Due geographical distribution data set (latitudes poleward 38°N), we do explore influence crustal field strength direction ionosphere.