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We present an analysis of the  COnvection, ROtation and planetary Transits  ( CoRoT ) star 105288363, a new Blazhko RR Lyrae star of type RRab ( f  0 = 1.7623 d −1 ), observed with the  CoRoT  spacecraft during the second long run in the direction of the Galactic Centre (LRc02, time‐base 145 d). The  CoRoT  data are characterized by an excellent time‐sampling and a low noise amplitude of 0.07 mmag in the 2–12 d −1  range and allow us to study not only the fine details of the variability of the star, but also long‐term changes in the pulsation behaviour and the stability of the Blazhko cycle. We use, among other methods, standard Fourier analysis techniques and O−C diagrams to investigate the pulsational behaviour of the Blazhko star 105288363. In addition to the frequency pattern expected for a Blazhko RR Lyrae star, we find an independent mode ( f  1 = 2.984 d −1 ) showing a  f  0 / f  1  ratio of 0.59 which is similar to that observed in other Blazhko RR Lyrae stars. The bump and hump phenomena are also analysed, with their variations over the Blazhko cycle. We carefully investigated the strong cycle‐to‐cycle changes in the Blazhko modulation ( P  B = 35.6 d), which seem to happen independently and partly diametrically in the amplitude and phase modulations. Furthermore, the phasing between the two types of modulations is found to change during the course of the observations.

The CoRoT star 105288363: strong cycle‐to‐cycle changes of the Blazhko modulation