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Magnetic Helicity Conservation

Published online by Cambridge University Press:  30 March 2016

Mitchell A. Berger
Mitchell A. Berger*
Affiliation:
Mathematics, University College London, Gower Street London WC1E 6BT U.K.

Abstract

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Magnetic Helicity measures basic structural properties of magnetic fields such as twist, shear, linking, writhe, and handedness. It is conserved in ideal MHD and approximately conserved during reconnection. The minimum energy state of a field with a given magnetic helicity is a linear force free field. Helicity plays an important role in MHD turbulence and dynamo theory, and provides a valuable observational tool in solar and space physics. Helicity conservation can be tracked from the solar dynamo to active regions to coronal mass ejections to magnetic clouds in interplanetary space.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 85 - 88
Copyright
Copyright © Astronomical Society of Pacific 2005

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