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We estimated the magnetic field strength at the event horizon for a sample ofsupermassive black holes (SMBHs) in active galactic nuclei (AGNs). Ourestimates were made using the values of the inclination angles of the accretiondisk to the line of sight, that we obtained previously from spectropolarimetricobservations in the visible spectrum. We also used published values of fullwidth at half maximum (FWHM) of spectral line $H_\beta$ from broad line region,masses of SMBHs and luminosity of AGNs at 5100 angstrom. In addition we usedliterature data on the spins of SMBHs obtained from their X-ray spectra. Ourestimates showed that the magnetic field strength at the event horizon of themajority of SMBHs in AGNs ranges from several to tens of kG and have meanvalues of about $10^4$G. At the same time, for individual objects, the fieldsare significantly larger - of the order of hundreds kG or even 1 MG.

Determination of magnetic field strength on the event horizon of supermassive black holes in active galactic nuclei