The Zeeman broadening of high n lines is derived. While in areas of the quiet Sun with field strengths of ~ 1 G the upper boundary of the observable frequency region of recombination lines is defined by electron impact broadening, in active regions with field strengths >~ 25 G the Zeeman broadening
Highnsolar radio recombination lines
โ Scribed by A. Greve
- Publisher
- Springer
- Year
- 1977
- Tongue
- English
- Weight
- 243 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0038-0938
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โฆ Synopsis
For a representative set of atmospheric and atomic parameters we determine the strengths of solar dielectronic recombination lines originating in ions with Z<~ 6 at frequencies of ~>70 GHz. We compare the line strengths derived here with those calculatedby Berger and Simon (1972) and find that our values for representative ions with Z~3 are lower by a factor 102-103, being mainly the result of the inclusion of the electronic pressure broadening. We outline the requirements for the detection of lines, which must establish an upper limit of at least ~10 -5 for the line to continuum ratio.
๐ SIMILAR VOLUMES
Radio recombination lines (RRL.) discovered about 25 years ago became a very effective tool for the investigation of interstellar matter (ISM). These lines are unique by the number of transitions and the spectral range observed: from 2 mm to 20 m wavelength. This allows to study the ISM under variet