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Excitation of Solar p-mode Oscillations by Flares

Basu, Sarbani; Antia, H. M.; Ambastha, Ashok

Solar flares release large amounts of energy at different layers of the solar atmosphere. It is, therefore, expected that major flares would be able to excite waves, thereby affecting the p-mode oscillation characteristics. From the analysis of MDI data, we find that power in p-modes appears to increase for some flares, beyond the normal values ex…

On the Rapid Variations of Solar Magnetic Fields

Venkatakrishnan, P.; Kumar, Brajesh; Ravindra, B.

We report on the rapid variations of solar magnetic fields that appear to be enhanced significantly above the background variability, at a few locations within the solar active regions, as observed with the Michelson Doppler Imager (MDI) on board the SOHO spacecraft. The pressure fluctuations estimated to arise from this variability far exceed the…

Solar Cycle Variation in GONG and MDI Data : 1995-2002

Tripathy, S. C.

Both GONG and MDI projects have measured p-mode frequencies of the Sun for more than 7 years. Here we review what we have learnt from the temporal variation of the oscillation frequencie and splitting coefficients.