An impact driven dynamo for the early Moon

Details An impact driven dynamo for the early Moon An impact driven dynamo for the early Moon

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1020l&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1020

Physics

Scientific paper

The origin of lunar magnetic anomalies remains unresolved after their discovery more than four decades ago. Several of these anomalies are associated with Nectarian-aged impact basins, and these signatures are the result of an impact melt sheet that was magnetized in the presence of a stable magnetic field over several thousands of years. The impact events that formed each of these basins were energetic enough to have unlocked the Moon from synchronous rotation, and the subsequent dissipation at the core-mantle boundary, combined with largescale fluid flows in the core excited by tidal instabilities, could have powered a lunar dynamo at the time their impact melt sheets were cooling through the Curie temperature. Predicted surface magnetic field strengths are on the order of several μT, consistent with paleomagnetic measurements.

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