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Estimates of magnetic field strength in relativistic jets of active galacticnuclei (AGN), obtained by measuring the frequency-dependent radio corelocation, imply that the total magnetic fluxes in those jets are consistentwith the predictions of the magnetically-arrested disk (MAD) scenario of jetformation. On the other hand, the magnetic field strength determines theluminosity of the synchrotron radiation, which forms the low-energy bump of theobserved blazar spectral energy distribution (SED). The SEDs of the mostpowerful blazars are strongly dominated by the high-energy bump, which is mostlikely due to the external radiation Compton (ERC) mechanism. This high Comptondominance may be difficult to reconcile with the MAD scenario, unless 1) thegeometry of external radiation sources (broad-line region, hot-dust torus) isquasi-spherical rather than flat, or 2) most gamma-ray radiation is produced injet regions of low magnetization, e.g., in magnetic reconnection layers or infast jet spines.

Reconciling models of luminous blazars with magnetic fluxes determined by radio core shift measurements