Identification of Pre-flare Processes and Their Possible Role in Driving a Large-scale Flux Rope Eruption with Complex M-class Flare in the Active Region NOAA 12371.

摘要: In this article, we study the origin of precursor flare activity and investigate its role towards triggering eruption a flux rope which resulted into dual-peak M-class (SOL2015-06-21T02:36) in active region NOAA 12371. The evolved two distinct phases with peak levels M2.1 M2.6 at an interval $\approx$54 min. exhibited striking moving magnetic features (MMFs) along sunspot rotation. Non-linear force free field (NLFFF) modelling corona reveals polarity inversion line trailing group is observationally manifested by co-spatial structures filament hot channel identified 304 94 A images, respectively, from Atmospheric Imaging Assembly (AIA). underwent prolonged phase enhancement followed relatively shorter period cancellation prior to onset led build up activation rope. Extreme ultra-violet (EUV) images reveal localised structured pre-flare emission, MMFs, adjacent location main flare. Our analysis strong, regions photospheric currents opposite polarities location, thereby making susceptible small-scale reconnection. Precursor reconnection most likely induced slipping reconnetion northern leg destabilization application virial theorem suggests that there was overall growth energy during decayed rapidly after successful transformation halo coronal mass ejection (CME).