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We carried out an electromagnetic acoustic analysis of the solar flare of 14August 2004 in active region AR10656 from the radio to the hard X-ray spectrum.The flare was a GOES soft X-ray class M7.4 and produced a detectable sun quake,confirming earlier inferences that relatively low-energy flares may be able togenerate sun quakes. We introduce the hypothesis that the seismicity of theactive region is closely related to the heights of coronal magnetic loops thatconduct high-energy particles from the flare. In the case of relatively shortmagnetic loops, chromospheric evaporation populates the loop interior withionized gas relatively rapidly, expediting the scattering of remaining trappedhigh-energy electrons into the magnetic loss cone and their rapid precipitationinto the chromosphere. This increases both the intensity and suddenness of thechromospheric heating, satisfying the basic conditions for an acoustic emissionthat penetrates into the solar interior.

From GHz to mHz: A Multiwavelength Study of the Acoustically Active 14 August 2004 M7.4 Solar Flare