Physics
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...44..155g&link_type=abstract
Solar Physics, vol. 44, Sept. 1975, p. 155-172.
Physics
40
Microwaves, Photosphere, Solar Magnetic Field, Solar Radio Bursts, Error Analysis, Magnetic Flux, Radiant Flux Density, Spectral Emission
Scientific paper
This paper sets forth various distributions of the peak flux-density spectra of large numbers of microwave bursts, based on observations at nine discrete frequencies between 245 and 35,000 MHz over the years from 1968 to 1971. As a foundation for the distribution studies, the basic spectral-classification system is outlined. The majority of burst spectra were found to contain a centimeter-wavelength component having a single spectral maximum in the 1400 to 35,000-MHz range; such spectra are designated C type. A study of the correlation of the spectral maximum frequency of the centimeter component and the photospheric magnetic-field strength of the associated region shows a tendency for greater correlation at higher maximum frequency for stronger magnetic fields. A study of the correlation for C type spectra between the maximum frequency and the quasi-cutoff frequency on the low-frequency side shows that for bursts of moderate peak flux density (50-500 sfu), the quasi-cutoff frequency is well correlated with the maximum frequency. Possible attenuating mechanisms responsible for the spectral shaping of the centimeter component are discussed.
Castelli John P.
Guidice Donald A.
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