Introduction to magnetic helicity.

Details Introduction to magnetic helicity. Introduction to magnetic helicity.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ppcf...41..167b&link_type=abstract

Plasma Phys. Controlled Fusion, Vol. 41, p. B167 - B175

Physics

27

Magnetic Flux Tubes: Magnetohydrodynamics, Magnetic Flux Tubes: Solar Physics, Magnetic Reconnection: Magnetohydrodynamics

Scientific paper

This paper reviews several aspects of magnetic helicity, including its history from Gauss to the present, its relation to field structure, its role in Taylor relaxation, and how it is defined for sub-volumes of space. Also, its importance in solar physics will be discussed. Magnetic helicity quantifies various aspects of magnetic field structure. Examples of fields possessing helicity include twisted, kinked, knotted, or linked magnetic flux tubes, sheared layers of magnetic flux, and force-free fields. Helicity thus allows us to compare models of fields in different geometries, avoiding the use of parameters specific to one model. Magnetic helicity is conserved in ideal magnetohydrodynamics and approximately conserved during reconnection.

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