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The Source of Free Energy for Type II Solar Radio Bursts

Published online by Cambridge University Press:  25 April 2016

Iver H. Cairns
Iver H. Cairns*
Affiliation:
School of Physics, University of Sydney
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Abstract

A theory for the source of free energy for the Langmuir waves producing Type II bursts is presented. It is shown that electrons accelerated at the Type II shock naturally develop a distribution function with an abrupt cutoff at a characteristic minimum parallel velocity (a ‘cutoff distribution) in a limited spatial volume ahead of the shock, irrespective of the acceleration process active at the shock. The long duration, narrow bandwidth Type II radiation is then explained in terms of Langmuir waves produced by a cutoff distribution. The theory also accounts in a natural way for split-band Type II bursts and herringbone bursts.

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Contributions
Information
Publications of the Astronomical Society of Australia , Volume 6 , Issue 4 , 1986 , pp. 444 - 446
Copyright
Copyright © Astronomical Society of Australia 1985

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