Filament Eruption in NOAA 11093 Leading to a Two-Ribbon M1 Class Flare and CME

Abstract: We present multi-wavelength analysis of an eruption event that occurred in Active Region (AR) NOAA 11093 on 7 August 2010, using data obtained from SDO, STEREO, RHESSI and GONG H$\alpha$ network telescope. From these observations, we inferred that upward slow rising motion of an inverse S-shaped filament lying along the polarity inversion line (PIL) resulted in a CME subsequent to a two-ribbon flare. Interaction of overlying field line across the filament with side lobe field lines, associated EUV brightening, and flux emergence/cancellation around the filament were the observational signatures of the processes leading to its destabilization and the onset of eruption. Moreover, the rising motion profile of filament/flux rope corresponded well with flare characteristics, viz., the reconnection rate and HXR emission profiles. Flux rope accelerated to the maximum velocities as a CME at the peak phase of the flare, followed by deceleration to an average velocity of 590 kms$^{-1}$. We suggest that the observed emergence/cancellation of magnetic fluxes near the filament caused it to rise, resulting in the tethers to cut and reconnection to take place beneath the filament; in agreement with the tether cutting model. The corresponding increase/decrease in positive/negative photospheric fluxes found in the post-peak phase of the eruption provides unambiguous evidence of reconnection as a consequence of tether cutting.