The Distribution of Radiation Across the Solar Disk at Metre Wave-length
Open Access
- 1 October 1953
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 113 (5) , 597-612
- https://doi.org/10.1093/mnras/113.5.597
Abstract
Measurements of the distribution of radio “ brightness ” across the solar disk have been made at wave-lengths of 1·4, 3·7 and 7·9 metres, using interferometers of variable aperture. The size of the emitting disk was observed to increase with increasing wave-length, the averaged equivalent temperature being reduced to 10 per cent of its central value at radii of 1·6 R0 , 2·2 R0 and 2·8 R0 for the wave-lengths 1·4, 3·7 and 7·9 metres respectively. At 1·4 metres, using interferometers with axes inclined at various anglesto the solar axis of rotation, it was shown that the shape of the Sun was approximately elliptical; the radial distance at which the brightness temperature was reduced to half was about 25 per cent greater at the equator than in the polar direction.Keywords
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