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Confinement of hot, hard X-ray producing electrons in solar flaresPossible thermal models for solar, hard X-ray emission, consisting of small volumes in which the electrons are rapidly heated to 400 million K, are examined to determine under what conditions such models can be more efficient than nonthermal models. The analysis is restricted to one dimension by supposing that the hot electrons are confined in a flux tube and that conduction and convection act only along the magnetic field. A conduction front, thin in relation to other length scales involved, separates the hot electrons from the relatively cold plasma. The range of conduction-front velocity is studied by systematizing the present knowledge of heat conduction and applying it first to a simple model in which convection is neglected, and then to a detailed numerical model in which convection is included. Convection in which mass motion goes to zero at the conduction front does not lead to a change in the conduction-front velocity compared to conduction alone, but does constitute another nonradiative energy loss which reduces the source efficiency.
Document ID
19790066812
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Smith, D. F.
(Colorado, University; High Altitude Observatory, Boulder, Colo., United States)
Lilliequist, C. G.
(High Altitude Observatory Boulder, Colo., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
Solar Physics
Accession Number
79A50825
Funding Number(s)
CONTRACT_GRANT: NSG-7507
Distribution Limits
Public
Copyright
Other

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