Magnetic Field and Plasma Observations at Mars: Initial Results of the Mars Global Surveyor Mission

Science  13 Mar 1998:
Vol. 279, Issue 5357, pp. 1676-1680
DOI: 10.1126/science.279.5357.1676

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The magnetometer and electron reflectometer investigation (MAG/ER) on the Mars Global Surveyor spacecraft has obtained magnetic field and plasma observations throughout the near-Mars environment, from beyond the influence of Mars to just above the surface (at an altitude of ∼100 kilometers). The solar wind interaction with Mars is in many ways similar to that at Venus and at an active comet, that is, primarily an ionospheric-atmospheric interaction. No significant planetary magnetic field of global scale has been detected to date (<2 × 1021 Gauss–cubic centimeter), but here the discovery of multiple magnetic anomalies of small spatial scale in the crust of Mars is reported.

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