EUV and radio spectrum of coronal holes
Abstract
From the intensity of 19 EUV lines whose formation temperature ranges from 30,000 to 1,400,000, two different models of the transition region and corona for the cell-center and the network are derived. It is shown that both these models give radio brightness temperatures systematically higher than the observed ones. An agreement with radio data can be found only with lines formed at low temperature (less than 850,000) by decreasing the coronal temperature and the emission measure. The possibility of resolving the discrepancy by using different ion abundances has been also investigated, with negative results.
- Publication:
-
Solar Physics
- Pub Date:
- March 1980
- DOI:
- 10.1007/BF00152792
- Bibcode:
- 1980SoPh...65..237C
- Keywords:
-
- Coronal Holes;
- Far Ultraviolet Radiation;
- Radio Spectra;
- Solar Radio Emission;
- Ultraviolet Astronomy;
- Atmospheric Models;
- Brightness Temperature;
- Gas Ionization;
- Line Spectra;
- Solar Spectra;
- Solar Physics