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AIMS: We studied unique data of a nova-like system MV Lyr during transitionfrom the high to low state and vice versa taken by the Kepler space telescope.We were interested in evolution of frequency components found previously byScaringi et al. in different data also obtained by Kepler. METHODS: We dividedthe light curve into 10 day segments and investigated the corresponding powerdensity spectra. We searched for individual frequency components by fittingwith Lorentzian functions. Additionally, we investigated the variability usingaveraged shot profiles calculated from the light curve divided into 10 equallyspaces subsamples. RESULTS: We found very complex changes of the power densityspectra. We focused our study onto three frequency components. Strong activityincrease is seen at low frequencies. Contrariwise, the high frequency part ofthe spectrum strongly decreases in power with specific rise in characteristicfrequencies of the individual components. We discuss various scenarios of thisphenomenology as reprocessing of X-rays in a receding accretion disc or aradiation from a more active region at the outer disc. Finally, we show thatvarious cataclysmic variables show similar characteristic frequencies in theirpower density spectra. These are dependent on activity stage, making thesituation similar to X-ray binaries.

Alternation of the flickering morphology between the high and low state in MV Lyr