Source characteristics of main and post-burst-increase phases of solar bursts at 17 GHz

Details Source characteristics of main and post-burst-increase phases of solar bursts at 17 GHz Source characteristics of main and post-burst-increase phases of solar bursts at 17 GHz

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87..373k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 87, Sept. 1983, p. 373-390.

Physics

12

Brightness Temperature, Microwave Emission, Radiant Flux Density, Solar Radio Bursts, Type 4 Bursts, Circular Polarization, Data Reduction, Microwave Interferometers, Polarization Characteristics, Superhigh Frequencies

Scientific paper

An analysis is presented of 24 solar bursts of peak fluxes above 50 sfu, which were observed with the 17 GHz interferometer at Nobeyama from September 1978 to December 1979. A model-fitting technique (Kosugi, 1982) was employed to derive both the position of centroid and the size of burst source with an uncertainty of a few arc sec. Results show that the main phase and the post-burst-increase phase are clearly distinguished not only by the morphological difference of the flux time profile, but also by the differences of brightness temperature, circular polarization degree, and size. The majority of these burst are found to show characteristics of impulsive bursts in the main phase. Rapid variations of the total flux are observed, which are often associated with the rapid shift of position and the rapid change of polarization degree. In the post-burst-increase phase, it is found that the expansion and ascension of the source occur in conjunction, with both movements having velocities on the order of 5 km/sec.

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