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A generic model for alternating lags in QPO harmonics is presented wherevariations in the photon spectrum are caused by oscillations in two parametersthat characterize the spectrum. It is further assumed that variations in one ofthe parameters is linearly driven by variations in the other after a time delay$t_d$. It is shown that alternating lags will be observed for a range of $t_d$values. A phenomenological model based on this generic one is developed whichcan explain the amplitude and phase lag variation with energy of thefundamental and the next three harmonics of the 67 mHz QPO observed in GRS1915+105. The phenomenological model also predicts the variation of theBicoherence phase with energy, which can be checked by further analysis of theobservational data.

Alternating lags of QPO harmonics : A Generic model and its application to the 67 millihertz QPO of GRS 1915+105