Wave observations at the foreshock boundary in the near-Mars space

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  • Skalsky A.
    Space Research Institute International Space Science Institute (ISSI)
  • Dubinin E.
    Space Research Institute International Space Science Institute (ISSI) Max-Planck-Institut fur Aeronomie
  • Delva M.
    International Space Science Institute (ISSI) Institut für Weltraumforschung/OAW
  • Grard R.
    Space Science Department, ESA/ESTEC
  • Klimov S.
    Space Research Institute
  • Sauer K.
    International Space Science Institute (ISSI) Max-Planck-Institut fur Aeronomie
  • Trotignon J. -G.
    Laboratoire de Physique et de Chimie de l'Environnement/CNES

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Wave and plasma measurements carried out by the Phobos-2 spacecraft in the Martian environment indicate that a part of solar wind electrons and ions are reflected and accelerated at the Martian bow shock. These particles streaming back into the solar wind lead to the formation of the foreshock region upstream the planetary bow shock. It is shown that the general structure of the foreshock at Mars is similar to that of the foreshock region upstream the Earth's bow shock. However, the electric emissions observed at frequencies around 100 Hz at the leading edge of electron foreshock at Mars have been never reported for observations in the similar region at Earth. The burst of these waves occurs before the spacecraft enters the electron foreshock identified with the onset of electron plasma waves and calculations of the magnetic connection to the planetary bow shock.

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