Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...73..363s&link_type=abstract
Solar Physics, vol. 73, Oct. 1981, p. 363-377.
Astronomy and Astrophysics
Astronomy
12
Brightness Temperature, Decametric Waves, Radio Astronomy, Solar Radio Emission, Brightness Distribution, Electron Density (Concentration), Electron Energy, Solar Corona, Solar Magnetic Field, Thermal Emission
Scientific paper
It is shown that the detection of the slowly varying component of solar radio emission at decameter wavelengths during extremely quiet periods is possible. Such observations are presented for the case of emissions at 34.5 MHz during the periods of July-December 1979 and February-March 1980, with half power beam widths of 26/40 arcmin in the east-west and north-south directions, respectively. The measured brightness temperatures are found to vary within the limits of 300,000 to 1,500,000 K. The average half power width of the brightness temperature distribution of the sun is about three solar radii. It is shown that thermal emission from the dense coronal regions can account for the observed brightness temperatures and half power widths.
Dwarakanath K. S.
Krishan Vinod
Sastry Ch. V.
Shevgaonkar R. K.
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