Investigation of a prolonged chromospheric flare

Details Investigation of a prolonged chromospheric flare Investigation of a prolonged chromospheric flare

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997azh....74..454b&link_type=abstract

Astronomicheskij Zhurnal, vol. 74, p. 454

Astronomy and Astrophysics

Astrophysics

2

Solar Flares, Chromosphere, H Lines, Balmer Series, Semiempirical Equations, Photosphere, Thermodynamic Properties, Astronomical Models, Calcium

Scientific paper

A magnitude 2 flare is studied in the H-alpha, H-beta, H-delta, and H CaII lines using spectra obtained on the echelle spectrograph of the Crimean Astrophysical Observatory. The flare was observed on September 1, 1990 from 5 h 41 m to 7 h 35 m UT in the penumbra of a spot. A series of semi-empirical models corresponding to various times in the development of the flare are calculated using a non-LTE code. The results of these calculations show that the density of the chromospheric layers was higher than the density corresponding to hydrostatic equilibrium. The extent of the chromospheric flare in height at the time of maximum did not exceed 1000 km. It is possible to jointly interpret the profiles of all four lines at the flare maximum only by assuming the presence of a thin hot layer in the upper photosphere.

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