Mars magnetism |
Mars magnetism |
May 3 2018, 07:25 PM
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Mars crustal magnetism as measured by Mars global Surveyor:
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: Has anyone read anything explaining why the curves they make should be roughly centered at the basin's antipodes? |
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Dec 2 2018, 11:45 PM
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Senior Member Group: Members Posts: 1056 Joined: 17-February 09 Member No.: 4605 |
Assuming that early Mars reflected Earth with a molten core dynamo, albeit smaller, then the magnetic stripes of alternating polarity seem to indicate reversals of the magnetic field combined with either plate tectonics, true polar wander or perhaps a combination of both. The dynamo shut down in the first billion years, possibly due to cooling and the residual, induced fields have been disrupted due to both large impact events and heating due to volcanic activity. It is a pity that we cannot measure the depth of the residual crustal magnetic field as this, combined with the results of Insights thermal determinations could allow us to pin down when the dynamo shut down.
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