Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...79..365p&link_type=abstract
Solar Physics, vol. 79, Aug. 1982, p. 365-374.
Physics
6
Brightness Temperature, Computer Programs, Coronal Holes, Radio Spectra, Ray Tracing, Solar Atmosphere, Chromosphere, Electron Density (Concentration), Neutral Particles, Spectrum Analysis
Scientific paper
Solar radio maps covering the mm-m wavelength range for the period 1973-1978 are used in computing the radio spectrum of an average coronal hole, in terms of the brightness temperature inside the hole, normalized by the brightness of the quiet sun outside it at several radio wavelengths. This radio spectrum can be used to obtain the changes of the quiet solar atmosphere inside coronal holes, and also as an additional check for coronal hole profiles obtained by other methods. A standard solar atmosphere and a computer program which includes ray tracing are used in an attempt to reproduce the observed radio spectrum by computing brightness temperatures at many different wavelengths, for a long series of modifications in electron density, neutral particle density, and temperature profiles of the standard solar atmosphere. The analysis indicates such changes inside the coronal hole as an expansion of the chromosphere by about 20%.
Baker Kile B.
Papagiannis Michael D.
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