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We study the response of a starved Kerr black hole magnetosphere to abruptchanges in the intensity of disk emission and in the global magnetosphericcurrent, by means of 1D general relativistic particle-in-cell simulations. Suchchanges likely arise from the intermittency of the accretion process. We findthat in cases where the pair production opacity contributed by the soft diskphotons is modest, as in, e.g., M87, such changes can give rise to delayed,strong TeV flares, dominated by curvature emission of particles accelerated inthe gap. The flare rise time, and the delay between the external variation andthe onset of the flare emitted from the outer gap boundary, are of the order ofthe light crossing time of the gap. The rapid, large amplitude TeV flaresobserved in M87 and, perhaps, other AGNs may be produced by such a mechanism.

The response of black hole spark gaps to external changes: A production mechanism of rapid TeV flares?