Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..138..223c&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 138, no. 2, April 1992, p. 223-231.
Physics
7
Lunar Occultation, Microwave Emission, Radio Emission, Solar Activity Effects, Thermal Emission, Brightness Temperature, High Resolution, Solar Eclipses, Spatial Resolution
Scientific paper
Solar quiescent active regions are known to exhibit radio emission from discrete structures. The knowledge of their dimensions and brightness temperatures is essential for understanding the physics of quiescent, confined plasma regions. Solar eclipses of 10 August, 1980 and 26 January, 1990, observed with high sensitivity and high time resolution at 22 GHz, allowed an unprecedented opportunity to identify Fresnel diffraction effects during lunar occultations of active regions. The results indicate the presence of quiescent discrete sources smaller than one arcsec in one dimension. Assuming symmetrical sources, their brightness temperatures were larger than 2 x 10 exp 7 K and 8 x 10 exp 7 K, for the 1980 and 1990 observations, respectively.
Correia Emilia
Kaufmann Patrik
Strauss Federico M.
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