Pasechnyk M. Dynamics of the photospheric layers during solar flares

The dissertation is devoted to investigation of the thermodynamical condition changes in the photospheric layers of the solar active complex during the flares using the spectral observations. The properties of the photospheric velocity field changes in height and time during flares are revealed. Semiempirical inhomogeneous photospheric models of weak solar flares were constructed. The models have three components - granular, intergranular and magnetic fluxtube. Revealed variations of the thermodynamical parameters indicated that the flare disturbance propagated from upper to the lower layers and had a wave character.