Accession Number : ADA194591

Title :   Coronal Magnetic Fields Produced by Photospheric Shear,

Corporate Author : STANFORD UNIV CA CENTER FOR SPACE SCIENCE AND ASTROPHYSICS

Personal Author(s) : Klimchuk, J A ; Sturrock, P A ; Yang, W -H

PDF Url : ADA194591

Report Date : Apr 1988

Pagination or Media Count : 41

Abstract : The magneto-frictional method for computing force-free fields examines the evolution of the magnetic field of a line dipole, when there is relative shearing motion between the two polarities. The energy of the sheared field can be arbitrarily large compared with the potential field. It is possible to fit the magnetic energy, as a function of shear amplitude, by a simple functional form. The fit parameters depend only on the distribution of normal field in the photosphere and the form of the shearing displacement. The energy is relatively more enhanced if the shear occurs: (1) where the normal field is strongest; (2) in the inner region of the dipole, near the axis; or (3) over a large fraction of the dipole area.

Descriptors :   *PHOTOSPHERE, *MAGNETIC DIPOLES, *SOLAR CORONA, AMPLITUDE, DISPLACEMENT, ENERGY, FORCE(MECHANICS), FREE FIELD, MAGNETIC FIELDS, REGIONS, SHEAR PROPERTIES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE