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Time Delays in Quasi-periodic Pulsations Observed during the X2.2 Solar Flare on 2011 February 15

Schmutz, W.; Zhukov, A. N.; Berghmans, D. +10 more

We report observations of quasi-periodic pulsations (QPPs) during the X2.2 flare of 2011 February 15, observed simultaneously in several wavebands. We focus on fluctuations on timescale 1-30 s and find different time lags between different wavebands. During the impulsive phase, the Reuven Ramaty High Energy Solar Spectroscopic Imager channels in t…