MAGNETIC-FIELD AND PLASMA OBSERVATIONS AT MARS - INITIAL RESULTS OF THE MARS GLOBAL SURVEYOR MISSION

The magnetometer and electron reflectometer investigation (MAG/ER) on the Mars Global Surveyor spacecraft has obtained magnetic field and pl asma observations throughout the near-Mars environment, from beyond th e influence of Mars to just above the surface (at an altitude of simil ar to 100 kilometers). The solar wind interaction with Mars is in many ways similar to that at Venus and at an active comet, that is, primar ily an ionospheric-atmospheric interaction. No significant planetary m agnetic field of global scale has been detected to date (<2 X 10(21) G auss-cubic centimeter), but here the discovery of multiple magnetic an omalies of small spatial scale in the crust of Mars is reported.