Articles | Volume 22, issue 6
Ann. Geophys., 22, 2277–2281, 2004
https://doi.org/10.5194/angeo-22-2277-2004
Ann. Geophys., 22, 2277–2281, 2004
https://doi.org/10.5194/angeo-22-2277-2004

  14 Jun 2004

14 Jun 2004

Solar wind modulation of the Martian ionosphere observed by Mars Global Surveyor

J.-S. Wang1,2 and E. Nielsen1 J.-S. Wang and E. Nielsen
  • 1Max-Planck-Institut für Aeronomie, 37191 Katlenburg-Lindau, Germany
  • 2School of Earth and Space Sciences, Peking University, Beijing 100871, China

Abstract. Electron density profiles in the Martian ionosphere observed by the radio occultation experiment on board Mars Global Surveyor have been analyzed to determine if the densities are influenced by the solar wind. Evidence is presented that the altitude of the maximum ionospheric electron density shows a positive correlation to the energetic proton flux in the solar wind. The solar wind modulation of the Martian ionosphere can be attributed to heating of the neutral atmosphere by the solar wind energetic proton precipitation. The modulation is observed to be most prominent at high solar zenith angles. It is argued that this is consistent with the proposed modulation mechanism.

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