Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..122...13b&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 122, no. 1, 1989, p. 13-27.
Physics
4
Noise Storms, Solar Radio Emission, Sunspots, Signature Analysis, Solar Cycles, Solar Terrestrial Interactions
Scientific paper
The flux density of a noise-storm continuum is known to depend on importance parameters of the associated sunspot group; e.g., its total area A. A study of the continua at 287, 234, 113, and 64 MHz, however, reveals (in case of the cycles 20 and 21) that the radiation signatures of sunspot groups, with a value of A kept fixed, vary systematically with time, indicating regular changes in relevant parameters of the overlying loop systems with the phase of the solar cycle. Intense continua at high frequencies occur preferably during the first activity maximum of a solar cycle, suggesting a decrease of the emissivity of sunspot groups with time. Intense continua at lower frequencies were mainly observed during the later phase of both cycles. The latter effect is shown to be attributed rather to a long-term variation of the spectral characteristics of the type I continua than to an enhanced number of intense type III continua.
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