How did a Major Confined Flare Occur in Super Solar Active Region 12192

摘要: We study the physical mechanism of a major X-class solar flare that occurred in super NOAA active region (AR) 12192 using data-driven numerical magnetohydrodynamic (MHD) modeling complemented with observations. With evolving magnetic fields observed at surface as bottom boundary input, we drive an MHD system to evolve self-consistently correspondence realistic coronal evolution. During two-day time interval, modeled field has been slowly stressed by photospheric evolution,which gradually created large-scale current sheet, i.e., narrow layer intense current, core AR. The was successively enhanced until it became so thin tether-cutting reconnection between sheared arcades set in, which led flare. reconnecting lines and their footpoints match well hot flaring loops ribbons, respectively, suggesting model successfully "reproduced" macroscopic process In particular, simulation, explained why this event is confined eruption-the consequent shared arcade instead newly formed flux rope. also found much weaker implosion effect comparing many other flares