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Evolving force-free magnetic fields. III - States of nonequilibrium and the preflare stageThe paper considers whether a neighboring magnetostatic equilibrium exists to allow a magnetic field initially in a force-free configuration to accommodate any imposed weak pressure. The following problem is treated. The foot points of the field are fixed and the plasma is frozen into the field lines under the approximation of infinite electrical conductivity. A weak pressure is introduced. It is determined infinitesimal plasma displacements exist to adjust the field lines to a new equilibrium without changing the field line connectivity. The analysis is carried out for the bipolar force-free fields forming one of two evolutionary sequences modeling the development of the preflare stage. It was found that for the force-free field corresponding to the quasi-static stage of evolution, the neighboring magnetostatic equilibrium always exists and the imposed gas pressure can be accommodated with a slight departure of the field from being exactly force free.
Document ID
19800065191
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Low, B. C.
(Chicago, University Chicago, Ill.; Lau Kuei Haut/S/Pte., Ltd., Singapore)
Date Acquired
August 10, 2013
Publication Date
July 1, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
Solar Physics
Accession Number
80A49361
Funding Number(s)
CONTRACT_GRANT: NGL-14-001-001
Distribution Limits
Public
Copyright
Other

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