EXPERIMENTAL DETERMINATION OF PHYSICAL PROCESSES IN SPACE, LEADING TO DEVIATIONS OF RADIO SYNCHROTRON RADIATION SPECTRA FROM THE POWER LAW

We present universal formulas for spectral characteristics of cosmic radio sources of synchrotron radiation upon the presence of spectral density maxima at certain frequencies ( spectra with negative curvature) taking into account most typical physical processes observed in space. On the basis of long-term observations of angular radiation structure of cosmic radio sources in the decameter wavelength range by the URAN radio interferometer system, we determine most probable physical processes resulting in spectra with extremum values for several quasars, radio galaxies, and their separate components. On the basis of these data, we estimate some parameters of cosmic medium, magnetic field, and angular sizes of compact radio sources and their components.