The radio brightness distribution along the solar limb observed on the Siberian Solar Radio Telescope

The radio brightness distribution at 5.2 cm has been obtained along the entire solar limb down to a level of 0.01 of brightness temperature at the disk center T 0 during the solar minimum. The measurements are based on strip scans from the Siberian Solar Radio Telescope. Data reduction included mode...

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Bibliographic Details
Published inAstronomy reports Vol. 49; no. 11; pp. 939 - 945
Main Author Krissinel', B B
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.11.2005
Subjects
Astrophysics
Data reduction
Luminosity
Radio astronomy
Radio telescopes
Solar physics
Wavelengths
Russia, Siberia
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Summary:The radio brightness distribution at 5.2 cm has been obtained along the entire solar limb down to a level of 0.01 of brightness temperature at the disk center T 0 during the solar minimum. The measurements are based on strip scans from the Siberian Solar Radio Telescope. Data reduction included model fitting of an actual solar scan for each position angle. The maximum limb brightness, 1.37 T 0 , in the derived distribution is at equatorial direction, where the radio radius exceeds the photosphere radius by 7%. Toward the poles, the brightness peak and radio radius gradually decrease to 1.01 T 0 and 1.005 R 0. The derived two-dimensional brightness distribution was used to calculate radio radius as a function of position angle for several wavelengths from 4 to 31.6 cm. These dependences are consistent with RATAN-600 observations at position angles 0DG and 25DG.
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ISSN:1063-7729
1562-6881
DOI:10.1134/1.2127997