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The position and polarization of Type V solar burstsObservations of the position and polarization of Type V solar radio bursts and their preceding Type III bursts are presented. The polarization, frequency range, source position, source movement, source size and brightness temperature of the bursts were measured using a 24-220 MHz spectropolarimeter, an 8-8000 MHz spectrograph and a three-frequency radioheliograph. Type V radiation is frequently found to have the opposite sense of circular polarization from that of the preceding Type III burst, with a degree of polarization similar to that of harmonic Type III radiation. A reversal of polarization is not observed when the accompanying Type III burst has no fundamental-harmonic structure, or when the Type V radiation is poorly developed. Possible mechanisms for the reversal are examined, including opposite magnetic field directions in Type III and V bursts, changes in mode coupling and a change in the mode of emission from o-mode for Type III to x-mode for Type V, and conditions needed for the mode change which is considered the most likely mechanism, are determined.
Document ID
19800064711
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dulk, G. A.
(Commonwealth Scientific and Industrial Research Organization Sydney, Australia)
Gary, D. E.
(Commonwealth Scientific and Industrial Research Organization, Div. of Radiophysics, Sydney, Australia; Colorado, University Boulder, Colo., United States)
Suzuki, S.
(Commonwealth Scientific and Industrial Research Organization Div. of Radiophysics, Sydney, Australia)
Date Acquired
August 10, 2013
Publication Date
August 1, 1980
Publication Information
Publication: Astronomy and Astrophysics
Volume: 88
Issue: 1-2,
Subject Category
Solar Physics
Accession Number
80A48881
Funding Number(s)
CONTRACT_GRANT: NSG-7287
Distribution Limits
Public
Copyright
Other

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