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Viscosity and the Chew-Goldberger-Low equations in the solar coronaA general discussion of the dominant terms in the stress tensor in a magnetized plasma such as the solar corona is presented. The importance of dissipative terms such as electrical resistivity, heat conduction, and interspecies collisions is assessed. For average coronal conditions, the proton stress tensor is found to reduce to the dominant terms in the classical expression for the viscous stress. The classical expression can fail in the transition region, however. In the diffusion region of reconnection, classical viscosity will be appropriate if the resistivity is very large, so that the diffusion region is broad, but in that case the viscous heating is small compared to the resistive heating. On the other hand, the more general expression for the stress tensor is required if the diffusion region is thin; the stress tensor will be important in this case. The electron stress tensor is also considered, and it is shown how the classical expression for electron viscosity can fail in the transition region and lower corona.
Document ID
19860063273
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hollweg, J. V.
(New Hampshire, University Durham, United States)
Date Acquired
August 12, 2013
Publication Date
July 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 306
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
86A48011
Funding Number(s)
CONTRACT_GRANT: NSG-7411
CONTRACT_GRANT: NAGW-76
Distribution Limits
Public
Copyright
Other

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