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We present a time-dependent multi-zone code for simulating the variability ofSynchrotron-Self Compton (SSC) sources. The code adopts a multi-zone pipegeometry for the emission region, appropriate for simulating emission from astanding or propagating shock in a collimated jet. Variations in the injectionof relativistic electrons in the inlet propagate along the length of the pipecooling radiatively. Our code for the first time takes into account thenon-local, time-retarded nature of synchrotron self-Compton (SSC) losses thatare thought to be dominant in TeV blazars. The observed synchrotron and SSCemission is followed self-consistently taking into account light travel timedelays. At any given time, the emitting portion of the pipe depends on thefrequency and the nature of the variation followed. Our simulation employs onlyone additional physical parameter relative to one-zone models, that of the pipelength and is computationally very efficient, using simplified expressions forthe SSC processes. The code will be useful for observers modeling GLAST, TeV,and X-ray observations of SSC blazars.

A multi-zone model for simulating the high energy variability of TeV blazars