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We present the multi-wavelength observations of a flux rope that was tryingto erupt from NOAA AR 11045 and the associated M-class solar flare on 12February 2010 using space and ground based observations from TRACE, STEREO,SOHO/MDI, Hinode/XRT and BBSO. While the flux rope was rising from the activeregion, an M1.1/2F class flare was triggered nearby one of its footpoints. Wesuggest that the flare triggering was due to the reconnection of a rising fluxrope with the surrounding low-lying magnetic loops. The flux rope reached aprojected height of ~0.15 Rs with a speed of ~90 km/s while the soft X-ray fluxenhanced gradually during its rise. The flux rope was suppressed by anoverlying field and the filled plasma moved towards the negative polarity fieldto the west of its activation site. We find the first observational evidence ofthe initial suppression of a flux rope due to a remnant filament visible bothat chromospheric and coronal temperatures that evolved couple of days before atthe same location in the active region. SOHO/MDI magnetograms show theemergence of a bipole ~12 h prior to the flare initiation. The emerged negativepolarity moved towards the flux rope activation site, and flare triggering nearthe photospheric polarity inversion line (PIL) took place. The motion of thenegative polarity region towards PIL helped in the build-up of magnetic energyat the flare and flux rope activation site. This study provides a uniqueobservational evidence of a rising flux rope that failed to erupt due to aremnant filament and overlying magnetic field, as well as associated triggeringof an M-class flare.

Multi-Wavelength Observations of a Flux Rope Failed in the Eruption and Associated M-Class Flare from NOAA AR 11045