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Nuclear gamma rays from stellar flaresSolar flare observations are consistent with the phenomenological description that a loop of magnetic flux is convected to the surface of the star and twisted. The resulting inductive current parallel to the field is dissipated at an enhanced rate throughout the field volume by current limiting instabilities. The steady state balance between joule heating and thermal conduction along the field lines of force to the denser, cooler surface establishes a temperature distribution. The expansion of heated and ionized surface layers leads to a pressure balance and hence predictable density and X-ray emission measure. The current limitation instabilities result observationally in the parallel current being transferred to run-away ions that reach a kinetic energy of some finite fraction of the inductive potential drop. The nuclear excitation gamma rays produced by such a run-away ion current are calculated for a white dwarf flare.
Document ID
19780024034
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Colgate, S. A.
(Los Alamos Scientific Lab. NM, United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1978
Publication Information
Publication: NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys.
Subject Category
Space Radiation
Accession Number
78N31977
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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