The effects of scattering on quiet Sun emission at frequencies less than 200 MHz

Autor:	H. L. Helfer, J. N. McMullin
Rok vydání:	1977
Předmět:	Physics Brightness Scattering Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Astrophysics Solar physics Heavy traffic approximation Solar maximum Computational physics Ray tracing (physics) Space and Planetary Science Radiative transfer Electron temperature
Zdroj:	Solar Physics. 53:471-488
ISSN:	1573-093X 0038-0938
DOI:	10.1007/bf00160290
Popis:	The problem of predicting the radio emission from the quiet Sun for meter and decameter waves may be formulated in terms of a standard radiative transfer problem with conservative scattering. One may therefore avoid the numerical complications involved in using a ray-tracing approach which incorporates a Monte-Carlo routine for representing scattering. The brightness and extent of the radio Sun are calculated for several values of the electron temperature and scattering parameter of Steinberg et al. (1971). It is concluded that the temperature and density model of Newkirk (1967) for solar maximum reasonably represents the observations. However, some observations appear to be inconsistent with scattering models and further observations are needed. It is shown (in Appendix B) that the standard ray-tracing technique incorporating a Monte-Carlo routine for the scattering may be replaced by a diffusion approximation.
Databáze:	OpenAIRE
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