Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58..287h&link_type=abstract
Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. 287-290.
Astronomy and Astrophysics
Astrophysics
4
Density Distribution, Electron Density Profiles, Solar Corona, Solar Radio Emission, Thermal Radiation, Brightness Temperature, Electron Energy, Nonthermal Radiation, Plasma Density, Very High Frequencies
Scientific paper
Computations of the meter-wavelength thermal radiation from coronal density enhancements (streamers) and depletions (holes) are carried out in a model taking absorption, refraction and scattering into account. The electron density distribution across these structures is approximated either by a Gaussian profile or by a sharp edged profile. It is shown that the sharp profile can reproduce correctly the enhanced emission from streamers if the temperature in the streamer is enhanced relative to the corona; thus there is no need to invoke a special nonthermal emission mechanism to explain the slowly varying component of the solar meter-wavelength radiation. For coronal holes, a decrease in both the electron density and temperature can account for their reduced emission no matter what their electron density profile is. This is in agreement with other observations.
Hoang Sang
Steinberg Jean-Louis
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