Variations of Microwave Emission from Solar Active Regions

Details Variations of Microwave Emission from Solar Active Regions Variations of Microwave Emission from Solar Active Regions

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..489g&link_type=abstract

Astronomy Letters, vol. 30, p. 489-495 (2004)

Astronomy and Astrophysics

Astronomy

4

Scientific paper

Based on observational data obtained with the RT-22 Crimean Astrophysical Observatory radio telescope at frequencies of 8.6 and 15.4 GHz, we investigate the quasi-periodic variations of microwave emission from solar active regions with periods Tp < 10 min. As follows from our wavelet analysis, the oscillations with periods of 3-5 min and 10-40 s have the largest amplitudes in the dynamic power spectra, while there are virtually no oscillations with Tp < 10 s. Our analysis shows that acoustic modes with Tp < 1 min strongly dissipate in the lower solar corona due to thermal conduction losses. The oscillations with Tp = 10-40 s are associated with Alfven disturbances. We analyze the influence of acoustic and Alfven oscillations on the thermal mechanisms of microwave emission in terms of the homogeneous model. We discuss the probable coronal heating sources.

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