Solar flare pulsation spectra
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We present the results of the analysis of quasiperiodic pulsations of chromospheric emission from three solar flares. The study is based on observational data obtained with two ground-based spectrographs: the Multichannel Flare Spectrograph and the Horizontal-Sonnen-Forschungs-Anlage 2 of the Ondřejov Observatory (Astronomical Institute of the Czech Academy of Sciences). The analysis of the power spectra of time profiles obtained using both spectrograms and filtergrams is carried out. The revealed periods were compared with the results of periodicity analysis in the X-ray and microwave ranges. For those events where the duration of observations allowed, a period close to 5 minutes was found from both the data of chromospheric observations and the data obtained in the X-ray and microwave ranges. We also found the periods about 1.4–1.8 and 2–3 minutes, which simultaneously appeared in all studied ranges.
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