Abstract
The energy distributions and time-scales of variability of "blazars" are interpreted in terms of an optically thin synchrotron radiation model, in which the electrons are injected into the source in the form of highenergy bursts, and flow down along the energy spectrum due to radiation loss. The time scale of variability observed at any wavelength is the time for synchrotron- radiation decay of electron energy. The model requ i res magnetic fields of the order of 10 - 100 gauss.
