Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..227c&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 2, Sept. 1977, p. 227-231.
Astronomy and Astrophysics
Astrophysics
4
Dynamic Models, Magnetic Fields, Radio Observation, Solar Corona, Solar Temperature, Stellar Models, Electron Density (Concentration), Far Ultraviolet Radiation, Solar Spectra
Scientific paper
A dynamical homogeneous model of coronal holes, taking into account a more than radial divergence of magnetic-field lines, is derived under the assumptions of a constant temperature at coronal levels and of a constant ratio (p-squared/Fc) of the square of the pressure to the conductive flux in the transition region. Available observations of brightness temperatures at several radio frequencies allow the determination of p-squared/Fe as well as the temperature and density at the base of the corona compatible with radio observations. The model so obtained gives the correct values of the EUV line intensities arising from the transition region, since they depend only on p-squared/Fc, while the Mg X coronal-line intensity at 625 A turns out to be lower than observed by about one order of magnitude. This indicates that the discrepancy previously found in the interpretation of EUV and radio data assuming a hydrostatic atmosphere still persists.
Chiuderi Drago Franca
Poletto Giannina
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