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3-minute oscillations in the chromosphere are attributed to both slowmagnetoacoustic waves propagating from the photosphere, and to oscillationsgenerated within the chromosphere itself at its natural frequency as a responseto a disturbance. Here we present an investigation of the spatial and temporalbehavior of the chromospheric 3-minute oscillations before, during, and afterthe SOL2011-02-15T01:56 X2.2 flare. Observations in ultraviolet emissioncentered on 1600 and 1700 Angstroms obtained at 24- second cadence from theAtmospheric Imaging Assembly on board the Solar Dynamics Observatory are usedto create power maps as functions of both space and time. We observe higher3-minute power during the flare, spatially concentrated in small areas 10pixels (4 arcseconds) across. This implies that the chromospheric plasma is notoscillating globally as a single body. The locations of increased 3-minutepower are consistent with observations of HXR flare emission from previousstudies, suggesting that these small areas are manifestations of thechromosphere responding to injection of energy by nonthermal particles. Thissupports the theory that the chromosphere oscillates at the acoustic cutofffrequency in response to a disturbance.

Spatial and temporal analysis of 3-minute oscillations in the chromosphere associated with the X2.2 Solar Flare on 2011 February 15