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We present RHESSI and TRACE observations of multiple flare activity thatoccurred in the active region NOAA 10656 over the period of two hours on 2004August 18. Out of four successive flares, there were three events of class Cwhile the final event was a major X1.8 solar eruptive flare. The events duringthe pre-eruption phase, i.e., before the X1.8 flare, are characterized bylocalized episodes of energy release occurring in the vicinity of an activeregion filament which produced intense heating along with non-thermal emission.A few minutes before the eruption, the filament undergoes an activation phaseduring which it slowly rises with a speed of ~12 km/s. The filament eruption isaccompanied with an X1.8 flare during which multiple HXR bursts are observed upto 100-300 keV energies. We observe a bright and elongated coronal structuresimultaneously in E(UV) and 50-100 keV HXR images underneath the expandingfilament during the period of HXR bursts which provides strong evidence forongoing magnetic reconnection. This phase is accompanied with very high plasmatemperatures of ~31 MK and followed by the detachment of the prominence fromthe solar source region. From the location, timing, strength, and spectrum ofHXR emission, we conclude that the prominence eruption is driven by thedistinct events of magnetic reconnection occurring in a current sheet formedbelow the erupting filament. These multi-wavelength observations also suggestthat the localized magnetic reconnections associated with differentevolutionary stages of the filament in the pre-eruption phase play a crucialrole in destabilizing the filament by a tether-cutting process leading tolarge-scale eruption and X-class flare.

RHESSI and TRACE observations of multiple flare activity in AR 10656 and associated filament eruption