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The polarization of second harmonic plasma emissionIt is shown that second-harmonic plasma emission is partially polarized in the sense of the ordinary mode of magnetoionic theory only when the Langmuir waves are confined to a small range of angles (less than 30 deg) to the magnetic-field lines. Consequently, Suzuki and Sheridan's (1977) observations of the polarization of harmonic Type III emission implies that (at least in the cases reported) the Langmuir waves must be nearly one-dimensional. For a nearly one-dimensional distribution, the degree of polarization and the frequency of observation should be related to the magnetic field. For the observed polarization of Type III bursts, the implied magnetic-field strengths are strong enough for induced scattering to cause the Langmuir waves to become nearly one-dimensional, which is consistent with the observed sense of polarization. In other applications of harmonic plasma emission where the Langmuir waves might be isotropic or in a loss-cone distribution, polarization in the sense of the extraordinary mode is predicted.
Document ID
19780057018
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Melrose, D. B.
(Colorado, University Boulder, Colo.; Australian National University, Canberra, Australia)
Dulk, G. A.
(Colorado, University Boulder, Colo., United States)
Smerd, S. F.
(Commonwealth Scientific and Industrial Research Organization Div. of Radiophysics, Sydney, Australia)
Date Acquired
August 9, 2013
Publication Date
June 1, 1978
Publication Information
Publication: Astronomy and Astrophysics
Volume: 66
Issue: 3, Ju
Subject Category
Plasma Physics
Accession Number
78A40927
Funding Number(s)
CONTRACT_GRANT: NSF ATM-76-14275
CONTRACT_GRANT: NAS8-32364
CONTRACT_GRANT: NSG-7287
Distribution Limits
Public
Copyright
Other

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