Structure and Evolution of an Inter–Active Region Large-scale Magnetic Flux Rope

Magnetic flux rope (MFR) has been recognized as the key magnetic configuration of solar eruptions. While pre-eruption MFRs within core active regions (ARs) have widely studied, those existing between two ARs, i.e., intermediate ones in weak-field regions, were rarely studied. There are also major eruptions that occurred such and study MFR there will help us understand physics mechanism underlying Here, with a nonlinear force-free field reconstruction coronal fields, we tracked five-day evolution covering full life large-scale inter-AR forming ARs NOAA 11943 11944, which is closely cospatial long sigmoidal filament channel an eruptive X1.2 flare occurring on 2014 January 7. Through topological analysis reconstructed 3D field, it found begins to form early 6; then its twist degree continuously increasing for over 30 hr, becomes highly twisted lines winding numbers approaching six turns, might be highest twisting extrapolated reported literature. The formation strength attributed continuous sunspot rotation AR 11944 cancellation ARs. associated filaments exhibit no significant change across time, indicating not responsible eruption. After flare, slowly disappears, possibly due disturbance by