S-component model computations applied to mean mm-wave measurements
✍ Scribed by S. Urpo; J. Hildebrandt; A. Krüger
- Publisher
- Springer
- Year
- 1987
- Tongue
- English
- Weight
- 656 KB
- Volume
- 112
- Category
- Article
- ISSN
- 0038-0938
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✦ Synopsis
Selected mm-wave observations with arc-min resolution of active regions in the central part of the solar disk obtained by the Mets~hovi Radio Research Station during the years 1978-1984 are discussed from the perspective of recently developed mean S-component models.
It is concluded that the ram-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 ~o in the ram-wave range. Basing 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 (15 ~o of cases) and of a group of further unspecified small-scale sources (30 ~o) 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.