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Analytical studies have raised the concern that a mysterious expulsion ofmagnetic field lines by a rapidly-spinning black hole (dubbed the black holeMeissner effect) would shut down the Blandford-Znajek process and quench thejets of active galactic nuclei and microquasars. This effect is however notseen observationally or in numerical simulations. Previous attempts atreconciling the predictions with observations have proposed several mechanismsto evade the Meissner effect. In this paper, we identify a new evasionmechanism and discuss its observational significance. Specifically, we showthat the breakdown of stationarity is sufficient to remove the expulsion of themagnetic field at all multipole orders, and that the associated temporalvariation is likely turbulent due to the existence of efficient mechanisms forsharing energy across different modes. Such an intrinsic (as opposed to beingdriven externally by, e.g., changes in the accretion rate) variability of theelectromagnetic field can produce the recorded linear correlation betweenmicrovariability amplitudes and mean fluxes, help create magnetic randomnessand seed sheared magnetic loops in jets, and lead to a better theoretical fitto the X-ray microvariability power spectral density.

Intrinsic electromagnetic variability in celestial objects containing rapidly spinning black holes