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We discuss the role that coherence phenomena can have on the intensityvariability of spectral lines associated with maser radiation. We do so byintroducing the fundamental cooperative radiation phenomenon of (Dicke's)superradiance and discuss its complementary nature to the maser action, as wellas its role in the flaring behaviour of some maser sources. We will considerexamples of observational diagnostics that can help discriminate between thetwo, and identify superradiance as the source of the latter. More precisely, weshow how superradiance readily accounts for the different time-scales observedin the multi-wavelength monitoring of the periodic flaring in G9.62+0.20E.

Variability, flaring and coherence -- the complementarity of the maser and superradiance regimes