Аннотация:Active Galactic Nuclei (AGN) are considered as potential extragalactic sources of very and
ultra high energy cosmic rays. According to theoretical predictions cosmic ray acceleration can take place
at the shock created by the expanding cocoons around active galactic nuclei as well as at AGN jets.
The measurements of AGN TeV spectra, the variability time scale of TeV emission can provide essential
information on the dynamics of AGN jets, the localization of acceleration region and an estimation of its size.
SHALON observations yielded data on extragalactic sources of different AGN types in the energy range of
800GeV–100TeV. The data from SHALON observations are compared with those from other experiments at
high and very high energies.