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

Abstract

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

to be appear in A&A, 15 pages, 12 figures

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