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Published online by Cambridge University Press: 04 August 2017
Electrodynamic models for the activity of galactic nuclei are shown to be current systems which can be examined in terms of equivalent circuits. The resulting inductive circuit which describes the coupling of the generator (black-hole and accretion disk) to the distant load (jet plasma) is prone to various instabilities. We consider the disruption of this current system and propose that ultra-energetic cosmic rays (E~1019–1021 eV) could be produced during the discharges, which occur at distances of ~1016–1018 cm from the central massive hole (M~108 M). Such discharges will also produce variable γ-ray and X-ray activity and we discuss observations of Cen A in this regard.