A study on the asymmetries in flare lines

Details A study on the asymmetries in flare lines A study on the asymmetries in flare lines

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cha%26a..14..413g&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 14, Issue 4, p. 413-421.

Astronomy and Astrophysics

Astrophysics

The Sun, Flares, Chromospheric Lines, Asymmetry

Scientific paper

We calculate the Hα and CaII K profiles under different velocity models with chromospheric condensations and investigate the effect of the velocity in different layers on the profiles from a semi-empirical standpoint. The results show that the short-time, Hα blue asymmetry in the early stage of the flare can be caused by condensations in the transition zone, that the subsequent red asymmetry is the result of the downward motion of matter in the upper chromosphere, while the later CaII K asymmetries can be explained by downward velocities of 10-20 km/s in the middle and lower chromosphere.

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