Solar Radiation in the Radio Spectrum. I. Radiation from the Quiet Sun

Details Solar Radiation in the Radio Spectrum. I. Radiation from the Quiet Sun Solar Radiation in the Radio Spectrum. I. Radiation from the Quiet Sun

Apr 1948

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1948rspsa.193...44m&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 193, Issue 1032, pp. 44-59

Physics

19

Scientific paper

The theory of the emission of thermal radiation from the solar envelope at radio-frequencies is worked out in detail. The Lorentz theory of absorption is used in conjunction with Kirchhoff's law to derive the effective temperature of the various regions of the solar disk over the radio spectrum. A maximum effective temperature approaching 106 degrees C is found in the vicinity of 1 m. wave-length. Limb brightening occurs at centimetre wave-lengths. It is shown that Gaunt's quantum mechanical expression for free-free emission yields results almost identical with the classical treatment, provided Chapman and Cowling's expression for the collision frequency in a fully ionized gas is used in the latter treatment. It is suggested that it may be preferable to treat problems of solar and galactic radio noise by classical methods, particularly when the refractive index of the medium departs appreciably from unity.

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