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Crustal remanence in an internally magnetized non-uniform shell: a possible source for Mercury’s magnetic field?

Aharonson, Oded and Zuber, Maria T. and Solomon, Sean C. (2004) Crustal remanence in an internally magnetized non-uniform shell: a possible source for Mercury’s magnetic field? Earth and Planetary Science Letters, 218 (3-4). pp. 261-268. ISSN 0012-821X. doi:10.1016/S0012-821X(03)00682-4. https://resolver.caltech.edu/CaltechAUTHORS:20130130-134442385

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Abstract

We consider the magnetic field of a shell uniformly magnetized by an internal dipole that is subsequently removed. The Gauss coefficients of the resulting field are given in terms of the spherical harmonic coefficients of the shell thickness. This general solution can easily be reduced to common special cases by superposition. For a shell of constant thickness the external field vanishes (by Runcorn’s theorem). For shell thickness variations caused by a laterally varying temperature field, the resulting magnetic moments are appreciably greater than the previously published correction due to rotational flattening. If the crust of Mercury contains rocks capable of sustaining high specific magnetizations, orif Mercury had a now-extinct dynamo field which was more intense than the Earth’s present core field, then the Mariner 10 observations of Mercury’s magnetic field are consistent in magnitude and geometry with the predictions of this model. For such a scenario, the requirement of a fractionally large molten outer core supporting a dynamo at present would be relaxed. The origin of Mercury’s magnetic field will be addressed with measurements to be made by NASA’s MESSENGER spacecraft.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/S0012-821X(03)00682-4DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X03006824PublisherArticle
ORCID:
AuthorORCID
Aharonson, Oded0000-0001-9930-2495
Additional Information:© 2003 Elsevier B. V. Received 31 March 2003; received in revised form 10 October 2003; accepted 15 November 2003. We thank Gauthier Hulot and Pierre Rochette for helpful reviews of an earlier draft and members of MIT’s planetary science seminar for intellectual stimulation of the idea.This research was supported by the NASA Planetary Geology and Geophysics Program under Grants NAG5-11650 and NAG5-10165.
Funders:
Funding AgencyGrant Number
NASANAG5-11650
NASANAG5-10165
Subject Keywords:Mercury; magnetism; Runcorn’s Theorem
Issue or Number:3-4
DOI:10.1016/S0012-821X(03)00682-4
Record Number:CaltechAUTHORS:20130130-134442385
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130130-134442385
Official Citation:Oded Aharonson, Maria T Zuber, Sean C Solomon, Crustal remanence in an internally magnetized non-uniform shell: a possible source for Mercury’s magnetic field?, Earth and Planetary Science Letters, Volume 218, Issues 3–4, 15 February 2004, Pages 261-268, ISSN 0012-821X, 10.1016/S0012-821X(03)00682-4.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36694
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:30 Jan 2013 22:18
Last Modified:09 Nov 2021 23:24

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