NONSTATIONARY POYNTING FLUX JET MODEL OF GAMMA-RAY VARIABILITY OF BLAZARS

A non-stationary model of jet formation and time-dependent electromagn etic - radio to gamma - emission is developed. The model is based on t he acceleration and creation of leptons at a propagating discontinuity (or front) of a Poynting flux jet. Equations are derived for the numb er, momentum, and energy of particles in the front taking into account synchrotron, synchrotron self Compton (SSC), and inverse Compton proc esses as well as photon-photon pair production. The apparent luminosit ies due to these processes are determined as functions of time.