A new cellular-automaton model for variability of black-hole objects
is presented.
The renewed cellular-automaton rule which describes the procedure of
model calculations is based on the induction equation of magnetic
fields and consists of two processes: input of fluctuations in the
magnetic field and dissipation of magnetic energy in the
form of magnetic reconnection.
This model can nicely reproduce the basic observational features
of the black-hole variability, such as aperiodic fluctuations in
light curves, 1/$f$-type power spectra, and lognormal flux distribution.
This successful reproduction strongly indicates magnetic fields
being the origin of producing black-hole variability.
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