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In this paper, we analyzed a failed and a successful eruption that initiatedfrom the same polarity inversion line within NOAA AR 11387 on December 25,2011. They both started from a reconnection between sheared arcades, havingdistinct pre-eruption conditions and eruption details: before the failed one,the magnetic fields of the core region had a weaker non-potentiality; theexternal fields had a similar critical height for torus instability, a similarlocal torus-stable region, but a larger magnetic flux ratio (of low corona andnear-surface region) as compared to the successful one. During the failederuption, a smaller Lorentz force impulse was exerted on the outward ejecta;the ejecta had a much slower rising speed. Factors that might lead to theinitiation of the failed eruption are identified: 1) a weaker non-potentialityof the core region, and a smaller Lorentz force impulse gave the ejecta a smallmomentum; 2) the large flux ratio, and the local torus-stable region in thecorona provided strong confinements that made the erupting structure regain anequilibrium state.

A comparative study between a failed and a successful eruption initiated from the same polarity inversion line in AR 11387