Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..141..303b&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 141, no. 2, p. 303-323.
Physics
19
Brightness Distribution, Solar Activity, Solar Eclipses, Sunspots, Very Large Array (Vla), Bremsstrahlung, Electron Density (Concentration), Harmonics, High Resolution, Photosphere, Solar Corona
Scientific paper
VLA-RATAN-600 observations of the sun around the partial solar eclipse in July 1990 are discussed. The relatively flat spectrum of the extended emission is attributed to the optically thin thermal bremsstrahlung of electrons trapped in a magnetic loop at coronal temperatures. Step-spectrum sunspot-associated emission is attributed to thermal gyroresonance radiation at different heights along the leg of a loop joining regions of positive magnetic polarity. Comparisons with predicted distributions of gyroresonance radio indicate that compact sunspot-associated sources lie at heights of 2500-17,500 km above the photosphere. Differences in the observed and predicted microwave emission suggest an inhomogeneous distribution of thermal plasma in the corona above the sunspot or the presence of localized flux tubes containing higher density plasma or nonpotential fields.
Bogod Vladimir M.
Gel'Freikh G. B.
Lang Kenneth R.
Opeikina L. V.
Shatilov V.
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