Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cha%26a...7..269w&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 7, Issue 4, p. 269-276.
Astronomy and Astrophysics
Astrophysics
Scientific paper
A new method of analysing the emission spectrum of solar prominences is presented, in which the source function is allowed to vary with optical depth. Least-squares fitting of the observed profile determines simultaneously the optical depth τ0, the Doppler width ΔλD and the factor α characterising the variation of the source function. This method is applied to the early Balmer lines in ten prominences of Ref. [1]. The results show that the source function of the self-reversed Hα line increases towards the centre of the prominence, the value at the centre is 1.2-2.5 times the value at the edge. Neglect of this variation will give too large values of τ0. The degree of attenuation by selfabsorption also depends on this variation. Discussion of the variation gives support to the view that the main exciting mechanism in solar prominences is the scattering of the incident radiation.
Shi Zhong-Xian
Wang Jing-Xiu
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