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Seismic Response to Solar Flares: Theoretical Predictions

We present initial results of theoretical modeling of oscillations excited inside the Sun during the impulsive phase of a solar flare. During this phase a high-energy electron beam heats the upper layers of the chromosphere, resulting in explosive evaporation of chromospheric plasma at supersonic velocities. This upward motion is balanced by recoil of the lower part of the chromosphere downward into the Sun that excites propagating waves in the solar interior. We demonstrate that for a typical impulsive energy-release event the momentum of the downflowing plasma is about 10 22 g cm s ?1 and the maximum amplitude of individual p modes will not exceed 1 mm s ?1. Therefore, a seismic response to only a very large flare with multiple energy sources can possibly be detected in oscillation power spectra. It may be possible to detect a different kind of seismic response due to a coherent signal of outgoing waves, the amplitude of which can reach 1 m s ?1 for the typical event. We compare flare effects with a cometary impact on the Sun.