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Mars magnetism
alan
post May 3 2018, 07:25 PM
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Mars crustal magnetism as measured by Mars global Surveyor:

Attached Image


I noticed the resemblance of parts of it to satellite tracks, but they are somewhat off center.

So I tried NASA's GISS map projector, and playing a hunch used the antipodes of the Borealis Basin as the center:

Attached Image


Has anyone read anything explaining why the curves they make should be roughly centered at the basin's antipodes?
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serpens
post May 8 2018, 05:50 AM
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Alternatively Sprenke and Baker provided a reasonably compelling explanation, taking into account true polar wander. The full paper can be found at Icarus Volume 147 Issue 1 (September 2000). Behind a paywall but a comprehensive abstract is here:

https://www.lpi.usra.edu/meetings/lpsc2000/pdf/1930.pdf
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