S-component model computations applied to mean mm-wave measurements

Details S-component model computations applied to mean mm-wave measurements S-component model computations applied to mean mm-wave measurements

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..112..119u&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 112, no. 1, 1987, p. 119-131.

Physics

7

Millimeter Waves, Solar Radio Emission, Stellar Models, Astronomical Maps, Brightness Distribution, Chromosphere, Solar Corona, Spatial Distribution, Stellar Spectrophotometry

Scientific paper

Selected mm-wave observations with arcmin resolution of active regions in the central part of the solar disk obtained by the Metsahovi Radio Research Station during the years 1978-1984 are discussed from the perspective of recently developed mean S-component models. It is concluded that mm-wave emission has a considerable (but at present unresolved) spatial fine structure. Compatibility with optical and EUV observations is only achieved by the assumption of embedding of bright plage elements in a quasi-quiet background according to filling factors of less than about 5 percent in the mm-wave range. Based on model calculations, predictions are made concerning the mm-wave brightness of the sunspot and plage components. Averaging over the whole S-component sources provides a good correspondence between observation and calculation. The necessary elimination of well identified burst sources and of a group of further unspecified small-scale sources from the above material indicates a greater contribution of 'hot-temperature' radiation to the mean emission from solar active regions at mm-wavelengths than had formerly been expected.

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