Spectral analysis of the 1984 October 18 solar prominence

Details Spectral analysis of the 1984 October 18 solar prominence Spectral analysis of the 1984 October 18 solar prominence

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cha%26a..14..262h&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 14, Issue 3, p. 262-272.

Astronomy and Astrophysics

Astrophysics

Sun-Prominences-Spectra

Scientific paper

On the basis of [11], we calculated the various physical parameters of the solar prominence of 1984 October 18, using further the method of complete linearization and a semi-empirical model on the N-LTE theory. Our conclusions are: 1. When finding the doppler width of prominence lines δλD, the method of complete linearization is more accurate than the classical method. 2. Our semi-empirical model based on the N-LTE computer program of [9] gave a central temperature of the prominence of ~ 5900 K, the temperature increasing from the centre outwards, a turbulence velocity of 5.5 ~ 6.5 km/s, and a mean hydrogen density nH = 3.8 × 1011 cm-3. Calcium was found to be mainly as CaII and CaIII, with n (CaIII) >> n (Call). 3. Our calculated distribution of the column density of hydrogen over energy levels showed that the lower energy levels are in N-LTE, the higher ones, in LTE.

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