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We analyze multi-wavelength data of a M7.9/1N class solar flare whichoccurred on 27 April, 2006 from AR NOAA 10875. GOES soft X-ray images providethe most likely signature of two interacting loops and their reconnection,which triggers the solar flare. TRACE 195 A images also reveal the loop-loopinteraction and the formation of `X' points with converging motion (~30 km/s)at the reconnection site in-between this interacting loop system. This providesthe evidence of progressive reconnection and flare maximization at theinteraction site in the active region. The absence of type III radio burstduring this time period indicates no opening of magnetic field lines during theflare energy release, which implies only the change of field linesconnectivity/orientation during the loop-loop interaction and reconnectionprocess. The Ondrejov dynamic radio spectrum shows an intense decimetric (DCIM)radio burst (2.5--4.5 GHz, duration ~3 min) during flare initiation, whichreveals the signature of particle acceleration from the reconnection siteduring loop-loop interaction. The double peak structures at 4.9 and 8.8 GHzprovide the most likely confirmatory signature of the loop-loop interaction atthe flare site in the active region. RHESSI hard X-ray images also show theloop-top and footpoint sources of the corresponding two loop system and theircoalescence during the flare maximum, which act like the current carryingflux-tubes with resultant opposite magnetic fields and the net force ofattraction. We also suggest that the shear motion/rotation of the footpoint ofthe smaller loop, which is anchored in the opposite polarity spot, may beresponsible for the flare energy buildup and then its release due to theloop-loop interaction.

Evidence of Solar Flare Triggering due to Loop-Loop Interaction Caused by Footpoint Shear-Motion