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Using the data obtained from XMM-Newton, we show the gradual evolution of twoperiodicities of ~4500 s and ~2200 s in the decay phase of the flare observedin a solar analog EK Dra. The longer period evolves firstly for first 14 ks,while the shorter period evolves for next 10 ks in the decay phase. We findthat these two periodicities are associated with the magnetoacoustic wavestriggered in the flaring region. The flaring loop system shows cooling and thusit is subjected to the change in the scale height and the acoustic cut-offperiod. This serves to filter the longer period magnetoacoustic waves andenables the propagation of the shorter period waves in the later phase of theflare. We provide the first clues of the dynamic behaviour of EK Dra's coronawhich affects the propagation of waves and causes their filtering.

First Evidence of the Frequency Filtering of Magnetoacoustic Waves in the Flaring Star EK Dra