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In this paper, we present a multi-wavelength analysis of an eruptivewhite-light M3.2 flare which occurred in active region NOAA 10486 on November1, 2003. Excellent set of high resolution observations made by RHESSI and TRACEprovide clear evidence of significant pre-flare activities for ~9 minutes inthe form of an initiation phase observed at EUV/UV wavelengths followed by theX-ray precursor phase. During the initiation phase, we observed localizedbrightenings in the highly sheared core region close to the filament andinteractions among short EUV loops overlying the filament which led to theopening of magnetic field lines. The X-ray precursor phase is manifested inRHESSI measurements below ~30 keV and coincided with the beginning of fluxemergence at the flaring location along with early signatures of the eruption.From the RHESSI observations, we conclude that both plasma heating and electronacceleration occurred during the precursor phase. The main flare is consistentwith the standard flare model. However, after the impulsive phase, intense HXRlooptop source was observed without significant footpoint emission. Moreintriguingly, for a brief period the looptop source exhibited strong HXRemission with energies up to 100 keV and significant non-thermalcharacteristics. The present study indicates a causal relation between theactivities in the preflare and main flare. We also conclude that pre-flareactivities, occurred in the form of subtle magnetic reorganization along withlocalized magnetic reconnection, played a crucial role in destabilizing theactive region filament leading to solar eruptive flare and associatedlarge-scale phenomena.

Pre-flare activity and magnetic reconnection during the evolutionary stages of energy release in a solar eruptive flare