Abstract
Induced (nonlinear) Compton interaction between spectrally narrow and incoherent radiation, corresponding to interstellar maser lines (OH and H/sub 2/O) with a high brightness temperature (T/sub b/approx. =10/sup 15/ K), and the surrounding rarefied plasma is considered in order to interpret the strong variability of intensity for unsaturated maser lines. The narrow amplified line of width deltav exhibits large-amplitude relaxation oscillations, generating at each oscillation a broad satellite at the Compton-Doppler distance >>deltav, on the longward side of the line, which behaves as a photon soliton moving downward on the frequency axis at constant speed and constant amplitude.
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