Местоположение издательства:New York, N.Y., United States
Первая страница:S489
Последняя страница:S491
Аннотация:We observed M1.9 class solar flare in NOAA 10808 active region by the HSFA spectrograph of Ondrejov observatory. We registered emission in Hydrogen H𝛼, H𝛽, H𝜀 lines and in H, K CaII lines. After the spectra processing the integral emission fluxes were derived. In the Joule heating framework we conducted calculation of gas parameters utilizing the physical conditions of the chromosphere, particularly self-absorbtion at spectral lines. All general populating and depopulating processes of discrete energetic levels were taken into account. We considered model of gas layers oriented perpendicular to the line of sight. Registered emission in five lines needed two-layered model for interpretation. The farther one has temperature 7300 K and concentration ∼ 10E14 cm−3. The nearby layer has has temperature 30000 K and concentration ∼ 10E12 cm−3.
