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We examine the characteristic properties of photospheric p-modes andsub-photospheric flows of active regions (ARs) observed during the period of26-31 October 2003. Using ring diagram analysis of Doppler velocity dataobtained from the Global Oscillations Network Group (GONG), we have found thatp-mode parameters evolve with ARs and show a strong association with flareactivity. Sub-photospheric flows, derived using inversions of p-modes, showstrong twist at the locations of ARs, and large variation with flare activity.

Variations in p-mode Parameters and Sub-surface Flows of Active Regions with Flare Activity