  We present the review of various methods of detection of magnetic field
strengths in the nearest regions of the active galaxy nuclei (AGN) which are
the high energetic machines. Original spectropolarimetric method developed in
the Pulkovo Observatory allows us to determine the magnitude and geometry of
the magnetic field in the region of the optical and more hard electromagnetic
radiation. The results of theoretical calculations are compared to the results
of spectropolarimetric observations of AGN. We used the method of determining
magnetic fields through the spectrum synchrotron radiation in the region of
synchrotron self-absorption. As the magnitude of magnetic field of the
extragalactic source depends very strongly on the angular size of extragalactic
source and therefore on the photometric distance the calculated magnetic field
magnitudes depends very strongly on the definite cosmological model. This
result allows us to present the new method for determination of the most
important cosmological parameters including dark matter and dark energy
parameters.
