Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983japa....4..289a&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 4, Dec. 1983, p. 289-293. Research supported by the Department of S
Astronomy and Astrophysics
Astrophysics
Brightness Temperature, Solar Radio Emission, Solar Spectra, Maximum Entropy Method, Microwave Spectra, Radial Distribution, Solar Eclipses
Scientific paper
Changes in solar radio-brightness temperature were derived at 2.8, 19.3 and 22.2 GHz from the observations of radio flux during the total eclipse of 1980 February 16. High-resolution MEM (maximum entropy method) spectra of the brightness temperature fluctuations at the three frequencies showed periodicities ranging from 3.5 min to 128 min. Between 3.5 min and 14.6 min there are several periodicities of comparable significance common to the three operating frequencies. If the corresponding variations in brightness temperature result from spatial variations in the solar radio emission, the observed periodicities imply scale sizes in the range 76000 km to 320000 km.
Alurkar Sadanand K.
Bhonsle Rajaram V.
Calla P. N. O.
Degaonkar S. S.
Raju G.
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