Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cha%26a..16..187y&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 16, Issue 2, p. 187-195.
Astronomy and Astrophysics
Astrophysics
Sun-Solar Flare-Caii K Line Asymmetry
Scientific paper
In this paper, we study the CaII K line spectra of eight flares observed with the Solar Tower Telescope at the Nanjing University. It is seen that the red asymmetry is common to all flares, i.e., that the intensity of the red wing at K1r is stronger than that of the blue wing at K1b and the distance between K1r and the line center is larger than that for K1b. Such red asymmetry is most obvious near the maximum of the K line intensity. However, the K line center does not display an obvious Doppler shift for all flares we study. By using the non-LTE theory when calculating the CaII K line profiles, we show that the asymmetry may be explained by the movement of material around the temperature minimum region. The velocity, in one example, can reach 20 km/s. Moreover, a statistical study shows that the temperature and the depth of the temperature minimum region are proportional to the maximum intensity of the flare emission.
Fang Cheng
Gan Wei-Qun
Yin Su-Ying
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