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The Transient Highly Excited Solar Flare Plasma

Published online by Cambridge University Press:  12 April 2016

L. D. De Feiter
L. D. De Feiter*
Affiliation:
The Astronomical Institute, Utrecht, The Netherlands

Abstract

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Recent observations of the energetic particles produced in solar flares indicate that the production of electrons, with energies up to about 100 keV, is a fairly common feature of small flares. In those flares the acceleration of protons and other nuclei does not extend beyond about 1 MeV.

The X-ray emission often exhibits two distinct components of which the first one is produced by non-thermal, the second by thermal electrons through bremsstrahlung collisions with the ambient ions. Along with these X rays, radio emission, in the microwave region, is observed. This radio emission is usually interpreted as due to gyrosynchrotron radiation from the same electrons.

In this review a discussion is presented of the processes occurring in solar flares with special reference to the acceleration and radiation processes.

Type
Section V / The Solar Flare Plasma
Information
International Astronomical Union Colloquium , Volume 14: Special Issue: Ultraviolet and X-Ray Spectroscopy of Astrophysical and Laboratory Plasmas , November 1972 , pp. 827 - 842
Copyright
Copyright © Reidel 1972

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