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Clumpy Langmuir waves in type III radio sources - Comparison of stochastic-growth theory with observationsDetailed comparisons are made between the Langmuir-wave properties predicted by the recently developed stochastic-growth theory of type III sources and those observed by the plasma wave experiment on ISEE 3, after correcting for the main instrumental and selection effects. Analysis of the observed field-strength distribution confirms the theoretically predicted form and implies that wave growth fluctuates both spatially and temporally in sign and magnitude, leading to an extremely clumpy distribution of fields. A cutoff in the field-strength distribution is seen at a few mV/m, corresponding to saturation via nonlinear effects. Analysis of the size distribution of Langmuir clumps yields results in accord with those obtained in earlier work and with the size distribution of ambient density fluctuations in the solar wind. This confirms that the inhomogeneities in the Langmuir growth rate are determined by the density fluctuations and that these fluctuations persist during type III events.
Document ID
19930050807
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Robinson, P. A.
(Sydney Univ. Australia)
Cairns, I. H.
(NASA Headquarters Washington, DC United States)
Gurnett, D. A.
(Iowa Univ. Iowa City, United States)
Date Acquired
August 16, 2013
Publication Date
April 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 407
Issue: 2
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
93A34804
Funding Number(s)
CONTRACT_GRANT: NAGW-2040
CONTRACT_GRANT: NAG5-1093
Distribution Limits
Public
Copyright
Other

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