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Our knowledge of magnetic activity of stars is mostly based on the study ofthe Sun and some spectroscopic surveys of a few hundreds of stars. However, thedetailed mechanisms of the solar magnetic activity cycle are not fullyunderstood. With the Kepler mission that is providing exquisite photometricdata for hundred of thousands of stars monitored continuously for more thanthree year, we can study changes in the light curves that can be related tomagnetic activity. We show here a few examples of stars for which we did atime-frequency analysis to look for such signature.

Study of stellar magnetic activity with CoRoT and Kepler data