MAGNETIC RECONNECTION DRIVEN BY EMERGENCE OF SHEARED MAGNETIC FIELD

摘要: Recurrent subflares (Class C) were observed in the NOAA 7608 active region on 27 October 1993. From multiwavelength observations (white-light, magnetic field, H-alpha, X-ray), obtained during a coordinated campaign between Pic du Midi and Yohkoh, it appears that these flares double ribbon caused by new flux emergence. As flare begins, X-ray emission with Yohkoh/SXT is loop-shaped axis almost parallel to inversion line, while development, loops appear at location of emerging flux. The extrapolation photospheric field linear force-free configuration allows identification given flares. Hα ribbons are located intersections computed quasi-separatrice layers (QSLs) chromosphere. We show initial fact formed several smaller directed nearly orthogonal direction their feet anchored close or ribbons. During development there which represent only one foot open largescale loops. For studied puzzling soft X-rays could be understood help data combined modeling coronal field. Further, from deduced topology, width QSLs our present knowledge 3-D reconnection, we conclude was due reconnection driven emergence sheared impacting pre-existing