The position and polarization of Type V solar bursts

Details The position and polarization of Type V solar bursts The position and polarization of Type V solar bursts

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88..218d&link_type=abstract

Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 218-229.

Astronomy and Astrophysics

Astronomy

10

Circular Polarization, Position (Location), Radio Astronomy, Radio Range, Solar Radio Bursts, Type 5 Bursts, Brightness Temperature, Plasma Radiation, Polarimetry, Solar Magnetic Field, Spectrographs, Spectroheliographs, Type 3 Bursts

Scientific paper

Observations 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.

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