Magnetic Mapping of Mars: Year Two

Physics

Scientific paper

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Scientific paper

The evolutionary history of Mars is recorded in the magnitude and morphology of Mars crustal magnetization, mapped in much detail by the Mars Global Surveyor spacecraft. We present global vector magnetic field maps obtained at 400 km mapping altitude, which reveal crustal magnetization with far greater signal fidelity than is possible for earth (e.g., MAGSAT). The global distribution of crustal magnetization is related to the dichotomy boundary which separates the young northern lowlands from the heavily cratered southern highlands. Magnetic lineations, first seen in low altitude (100 km) aerobraking observations, are also seen in the higher altitude mapping observations, along with a number of intriguing circular features also without visible counterparts. The magnitude of crustal magnetization is huge (20 X Earth) and requires large volumes of intensely magnetized rock, likely multi-domain hematite but possibly also single domain magnetite or pyrrhotite.

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