The polarization of decimetric pulsations

Details The polarization of decimetric pulsations The polarization of decimetric pulsations

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104...57a&link_type=abstract

(CNR, Workshop on Radio Continua during Solar Flares, Duino, Italy, May 27-31, 1985) Solar Physics (ISSN 0038-0938), vol. 104, M

Physics

18

Circular Polarization, Decimeter Waves, Solar Oscillations, Solar Radio Bursts, Broadband, Stellar Models

Scientific paper

A sample of 10 decimetric broadband pulsations were observed in 1980-1983 and analyzed in polarization. Half of the data set was 85-100 percent circularly polarized, the other half showed a mild polarization of 15-55 percent. The polarization is constant in time and frequency for the strongly polarized group. All the mildly polarized bursts originate from near the limb; the lower degree of circular polarization is likely to be caused by depolarization due to propagation effects. The degree of polarization is constant throughout the event, but varies in frequency for the mild polarized group. Following the leading spot hypothesis, the magneto-ionic mode of the emission was found to be extraordinary. The high circular polarization of the pulsations was interpreted to be determined by the emission mechanism itself, not by propagation effects or cut-offs (contrary to the metric type I noise storms). Implications for pulsation models are discussed.

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