The Feedback Dynamo of Mercury

Details The Feedback Dynamo of Mercury The Feedback Dynamo of Mercury

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1162h&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1162

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Scientific paper

The observed weakness of Mercury's magnetic field poses a long-standing puzzle to dynamo theory. Using numerical dynamo simulations we show that it can be explained by a negative feedback process between the planet's magnetospheric and internal fields. Without the feedback a small internal field is amplified by the dynamo process until it reaches Earth-like values. With the feedback, however, the field strength levels off at a much lower strength that is compatible with the observations at Mercury. The resulting surface field is clearly dominated by a dipole component. This will allow to discriminate the feedback model against other candidates once MESSENGER and BepiColombo data allow to construct more accurate field models.

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