Effect of Solar Flares on Acoustic Oscillations Within the Sun

Astronomy and Astrophysics – Astronomy

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Scientific paper

We investigate the effects that energetic flares have on the acoustic oscillations observed on the surface of the sun. We use the ring-diagram technique, one of the local helio-seismology method, in order to comprehend the role of the flare in exciting the oscillation modes. We analyze these oscillations before, during and after the onset of the flare. The ratio of the mode parameters at different phases of the flare with respect to the pre-flare phase provides us with insight as to how the modes of oscillation are changing with the evolution of the flare. We find that in 32% of the cases studied, the power is absorbed almost completely in the active region. Out of the remaining 68%, a clear enhancement of the power is seen in 23% while a partial enhancement is seen in the other 45%.
This work is carried out through the National Solar Observatory Research Experiences for Undergraduate (REU) site program, which is co-funded by the Department of Defense in partnership with the National Science Foundation REU Program. The National Solar Observatory is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation.

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