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Clumpy Langmuir waves in type III solar radio burstsA model is developed for type III radio emission in the interplanetary medium based on recent data on Langmuir waves, associated with ion sound waves, density fluctuations in the interplanetary plasma, streaming electrons and radio emission. In this model, Langmuir wave growth is suppressed by refraction in field-aligned density irregularities except near density minima where clumps of Langmuir waves form. Quasi-linear relaxation limits the growth of the Langmuir waves in the clumps. The radio emission, which is attributed to coalescence of the Langmuir waves with associated ion sound waves, saturates at a brightness temperature equal to the effective temperature of the Langmuir waves, estimated to be between 10 to the 15th and 10 to the 16th K from obserrvational data. The model is consistent with all the relevant data on type III events. In particular, it accounts naturally for observed brightness temperatures of type III bursts.
Document ID
19870023057
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Melrose, D. B.
(Sydney Univ. Australia)
Cairns, I. H.
(Sydney, University Australia)
Dulk, G. A.
(Colorado, University Boulder, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1986
Publication Information
Publication: Astronomy and Astrophysics
Volume: 163
Issue: 1-2
ISSN: 0004-6361
Subject Category
Solar Physics
Accession Number
87A10331
Funding Number(s)
CONTRACT_GRANT: NSG-7287
CONTRACT_GRANT: NAGW-91
Distribution Limits
Public
Copyright
Other

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