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=1990acaps..10..277g&link_type=abstract

(Acta Astrophysica Sinica, vol. 10, no. 3, 1990, p. 277-285) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 14, Dec.

Astronomy and Astrophysics

Astrophysics

6

Chromosphere, Solar Flares, Solar Spectra, Symmetry, Line Spectra, Radiative Transfer, Velocity Distribution

Scientific paper

The H-alpha and CaII K profiles are calculated under different velocity models with chromospheric condensations, and the effect of the velocity is investigated in different layers on the profiles from a semiempirical standpoint. The results show that the short-time, H-alpha blue asymmetry in the early stage of the flare can be caused by condensations in the transition zone, and 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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