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R. Sivron, E.A. Goralski (Grand Valley State University)
The X-ray spectral features of Seyfert I nuclei, are presumably due to the reprocessing of emission from hot (relativistic) plasma by a {\it{stationary}} thin accretion disk near a black hole, and a {\it{stationary}} optically thin warm absorber in the line of sight. The non-variable structure is inconsistent with the high amplitude non-linear light-curve in some Seyferts, and the manner in which the spectrum varies in others. Several non-stationary configurations were recently proposed in theoretical work on self-organized criticality (SOC) in near-Eddington accreting sources. It is shown that the SOC models are consistent with the light-curve and spectral variability and of Seyfert I MCG -6-30-15. Preliminary analysis of other Seyferts gives similar results. It is also shown that the {\it{gravitational}} redshift of the Fe K line is needed in non-stationary geometries.