Construction of dynamic models of the photospheric and chromospheric layers of solar flares for studying the conditions of their appearance and evolution

Heading: 
Astronomy and Astrophysics
1Shchukina, NG, 1Kondrashova, NM, 1Khomenko, OV, 1Kostyk, RI, 1Chornogor, SM, 1Alikaeva, KV, 1Olshevsky, VL, 1Osipov, SM, 1Andriyenko, OV
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2008, 14 ;(6):052-068
https://doi.org/10.15407/knit2008.06.052
Publication Language: Russian
Abstract: 
Spectropolarimetric observations of quiet and active regions of the solar surface have been carried out. Physical processes which take place in photospheric and chromospheric layers of active regions before and during the flare were investigated. A set of semi-empirical models of flares and active regions which describe evolution of velocity field, magnetic field, and temperature with time has been created. Dynamical processes in the quiet photosphere, such as granulation and small-scale magnetic fields were studied. These processes define major photospheric properties and stimulate non-radiative energy transfer into the upper layers – chromosphere and corona. Probability Distribution Functions of the small-scale magnetic fields in the internetwork were obtained. Energy flux produced by such fields was estimated. The parameters of the convective component of granulation velocity field and intensity field were found. Their correlation was studied at heights from the continuum formation level to the temperature minimum. MHD-wave propagation in the solar atmosphere in non-uniform structures with magnetic field have been modeled. Wave transformation and energy transport was also studied. New diagnostic and software tools for interpretation of spectropolarimetric observations were developed. These tools account for anisotropic structure of the solar atmosphere and small-scale magnetic fields. These results were obtained as a part of research project: "Construction of dynamic models of the photospheric and chromospheric layers of solar flares for studying the conditions of their appearance and evolution". This project is a part of basic research program of NASU: "Construction of theory, methods, and informational technologies for complex study of Sun- Earth relations as a basis of space-weather forecasts".
Keywords: dynamical processes, quiet photosphere, semi-empirical models of flares and active regions
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