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The BLLac object S4 0954+65 is one of the main targets of the Urumqimonitoring program targeting IntraDay Variable (IDV) sources. Between August2005 and December 2009, the source was included in 41 observing sessions,carried out at a frequency of 4.8 GHz. The time analysis of the collected lightcurves, performed by applying both a structure function analysis and aspecifically developed wavelet-based algorithm, discovered an annual cycle inthe variability timescales, suggesting that there is a fundamental contributionby interstellar scintillation to the IDV pattern of the source. The combineduse of the two analysis methods also revealed that there was a dramatic changein the variability characteristics of the source between February and March2008, at the starting time of a strong outburst phase. The analysis' resultssuggest that the flaring state of the source coincides with the appearance ofmultiple timescales in its light curves, indicating that changes in thestructure of the relativistically moving emitting region may strongly influencethe variability observed on IDV timescales.

A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65