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Multi--wavelength studies of energetic solar flares with seismic emissionshave revealed interesting common features between them. We studied the firstGOES X--class flare of the 24th solar cycle, as detected by the Solar DynamicsObservatory (SDO). For context, seismic activity from this flare(SOL2011-02-15T01:55-X2.2, in NOAA AR 11158) has been reported in theliterature (Kosovichev, 2011; Zharkov et al., 2011). Based on Dopplergram datafrom the Helioseismic and Magnetic Imager (HMI), we applied standard methods oflocal helioseismology in order to identify the seismic sources in this event.RHESSI hard X-ray data are used to check the correlation between the locationof the seismic sources and the particle precipitation sites in during theflare. Using HMI magnetogram data, the temporal profile of fluctuations in thephotospheric line-of-sight magnetic field is used to estimate the magneticfield change in the region where the seismic signal was observed. This leads toan estimate of the work done by the Lorentz-force transient on the photosphereof the source region. In this instance this is found to be a significantfraction of the acoustic energy in the attendant seismic emission, suggestingthat Lorentz forces can contribute significantly to the generation ofsunquakes. However, there are regions in which the signature of theLorentz-force is much stronger, but from which no significant acoustic emissionemanates.

Magneto--Acoustic Energetics Study of the Seismically Active Flare of 15 February 2011