Affiliation:
1. Moscow State University; Astronomical Institute of the Czech Academy of Sciences
2. Moscow State University
3. Lomonosov Moscow State University
Abstract
Тhe article is devoted to analyses of solar flare SOL2012-04-27 emission in Hydrogen, Helium and Calcium
spectral lines observed on horizontal solar equipment HSFA-2 in Ondˇrejov observatory. The integrated fluxes
are calculated. The data collected are treated in the approach of the fast energy release followed by gas
evaporation. The gas parameters are calculated with chromosphere conditions and spectral line self-absorption
taken into account. Encompassing of six lines allows to reveal the temperature, density and extent of the gas
with high degree of validity. The best agreement of the theory with observations is obtained in the model
of the spread of inhomogeneous clouds, each of which has hot (T ≈ 18000 ÷ 19500 K) and cool regions
(T ≈ 8000 ÷ 9000 K). On average, one cloud gives about ten percent of the total flux.
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