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We analyse multiwavelength observations of a western limb flare (C3.9)occurred in AR NOAA 111465 on 30 April 2012. The high resolution imagesrecorded by SDO/AIA 304, 1600 \AA\ and Hinode/SOT H$\alpha$ show the activationof a mini-filament (rising speed$\sim$40 km s$^{-1}$) associated with kinkinstability and the onset of a C-class flare near the southern leg of thefilament. The first magnetic reconnection occurred at one of the footpoints ofthe filament causing the breaking of its southern leg. The filament showsunwinding motion of the northern leg and apex in the counterclockwise directionand failed to erupt. A flux-rope (visible only in hot channels, i.e., AIA 131and 94 \AA\ channels and Hinode/SXT) structure was appeared along the neutralline during the second magnetic reconnection taking place above the kinkedfilament. Formation of the RHESSI hard X-ray source (12-25 keV) above thekinked filament and simultaneous appearance of the hot 131 \AA\ loopsassociated with photospheric brightenings (AIA 1700 \AA) suggest the particleacceleration along these loops from the top of the filament. In addition, EUVdisturbances/waves observed above the filament in 171 \AA\ also show a closeassociation with magnetic reconnection. The flux rope rises slowly ($\sim$100km s$^{-1}$) producing a rather big twisted structure possibly by reconnectionwith the surrounding sheared magnetic fields within $\sim$15-20 minutes, andshowed an impulsive acceleration reaching a height of about 80--100 Mm. AIA 171and SWAP 174 \AA\ images reveal a cool compression front (or CME frontal loop)surrounding the hot flux rope structure.

Multiwavelength observation of a large-scale flux rope eruption above kinked mini-filament