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Planetary magnetism

Stevenson, D. J. (1975) Planetary magnetism. In: Magnetism and magnetic materials. AIP Conference Proceedings. No.24. American Institute of Physics , New York, pp. 781-784. ISBN 978-0-88318-123-2.

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Magnetic fields are ubiquitous in the Universe because of the absence (or rarity) of free magnetic monopoles. However, the large scale concentration of magnetic flux in an essentially non‐ferromagnetic body such as the Earth, requires a non‐cosmogonical explanation. A regenerative process must exist because the magnetic diffusion time in the Earth is much less than the age of the Earth. The most popular explanation is the dynamo model in which convectional or precessional fluid motions in the core induce and sustain a magnetic field. Other mechanism are possible in which, for example, thermoelectric effects are important. The advent of planetary probes has led to a dramatic increase in information on the magnetic fields of the five innermost planets. In particular, the recent flybys of Jupiter (by Pioneer 10) and Mercury (by Mariner 10) have yielded unexpected results. These observations are discussed and shown to be reconcilable with present theories of planetary magnetism and solar system chemistry. Some predictions are made for Saturn, Uranus and Neptune.

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Stevenson, D. J.0000-0001-9432-7159
Additional Information:© 1975 American Institute of Physics. I would like to thank Drs. N. W. Ashcroft, C. Sagan, E. E. Salpeter and S. Sorer for their suggestions and comments. Support by NSF Grant GP-36425X and NASA Grant NGR-33-010-188 is gratefully acknowledged.
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Series Name:AIP Conference Proceedings
Issue or Number:24
Classification Code:PACS: 96.50.S-; 91.35.-x
Record Number:CaltechAUTHORS:20131011-133410392
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41902
Deposited By: Tony Diaz
Deposited On:11 Oct 2013 23:32
Last Modified:03 Oct 2019 05:53

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