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Arguments for fundamental emission by the parametric process L yields T + S in interplanetary type III burstsObservations of low frequency ion acoustic-like waves associated with Langmuir waves present during interplanetary Type 3 bursts are used to study plasma emission mechanisms and wave processes involving ion acoustic waves. It is shown that the observed wave frequency characteristics are consistent with the processes L yields T + S (where L = Langmuir waves, T = electromagnetic waves, S = ion acoustic waves) and L yields L' + S proceeding. The usual incoherent (random phase) version of the process L yields T + S cannot explain the observed wave production time scale. The clumpy nature of the observed Langmuir waves is vital to the theory of IP Type 3 bursts. The incoherent process L yields T + S may encounter difficulties explaining the observed Type 3 brightness temperatures when Langmuir wave clumps are incorporated into the theory. The parametric process L yields T + S may be the important emission process for the fundamental radiation of interplanetary Type 3 bursts.
Document ID
19850014001
Document Type
Conference Paper
Authors
Cairns, I. H. (Iowa Univ. Iowa City, IA, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1984
Publication Information
Publication: ESA Plasma Astrophys.
Subject Category
PLASMA PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS5-26819
CONTRACT_GRANT: NGL-16-001-043
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.