Volvach O. Variability, structure and spectrum of the radio radiation of active galaxies nucleus by observations at radio telescopes.

The principal objective of the Thesis is the study of compact extra galaxy radio sources, namely of active galaxies nucleus and their variability, spectrum, VLBI-structure, interaction, in the wide diapason of frequencies of the radio band. The data were obtained by author during observations at the 22-m radio telescope (RT-22) of the Crimean Astrophysical Observatory and with WSRT as well as in the European VLBI Network. The variations of mm radiation of more than 30 extragalactic radio sources were studied as well as the data on their burst maximum and burst amplitudes were obtained. There were the variability of the spectrum and the radiation of the OH471 (z=3.4). Estimates of the position and the horizontal velocity of the Simeiz radio astronomical station were obtained using VLBI observations.