Statistics – Computation
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985basi...13..387d&link_type=abstract
Astronomical Society of India, Bulletin, vol. 13, Dec. 1985, p. 387-393.
Statistics
Computation
1
Coronal Holes, Emission Spectra, Line Spectra, Solar Corona, Solar Spectra, Extreme Ultraviolet Radiation, Magnesium, Silicon
Scientific paper
Detailed computations of emission line intensities of the ions of boron, carbon, and oxygen isoelectronic sequences are reported which used the model atmosphere of Kopp and Orrall (1976) for the quiet sun and coronal hole regions. The results indicate that, for lower temperature ions in the chromosphere-corona transition region, the contrast between the quiet sun and coronal hole regions is not sharp. For higher temperature ions, lines formed in the coronal holes are weaker by a factor of two or more as compared to lines of the same ions in the quiet sun region. At low temperatures, the relative steepness of temperature gradient in the transition region for the quiet sun, in combination with relative ion abundance, might reduce the contrast between the quiet sun and the coronal hole regions. At higher temperatures, electron density may be mainly responsible for the significantly lower intensity of lines in the coronal hole regions.
Dwivedi Bhola N.
Raju K. P.
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