Variations in p-mode parameters and sub-surface flows of active regions with flare activity

R. A. Maurya* and A. Ambasthay
Udaipur Solar Observatory, Physical Research Laboratory, Udaipur-313001, India

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We examine the characteristic properties of photospheric pmodes and sub-photospheric flows of active regions (ARs) observed during the period of 26-31 October 2003. Using ring diagram analysis of Doppler velocity data obtained from the Global Oscillations Network Group (GONG), we have found that p-mode parameters evolve with ARs and show a strong association with flare activity. Sub-photospheric flows, derived using inversions of p-modes, show strong twist at the locations of ARs, and large variation with flare activity.

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Keywords : Sun: helioseismology – Sun: flares