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The Ellerman bomb and ultraviolet burst triggered successively by an emerging magnetic flux rope

Research in Astronomy and Astrophysics 2021年第9期21卷 163-179页

作者：程冠冲倪蕾陈亚杰 Udo Ziegler 林隽 Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Solar Activity National Astronomical ObservatoriesBeijing 100101China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China School of Earth and Space Sciences Peking UniversityBeijing 100871China Astrophysikalisches Institut Potsdam D-14482 Potsdam Germany

Ellerman bombs(EBs)and ultraviolet(UV)bursts are common brightening phenomena,which are usually generated in the low solar atmosphere of emerging flux *** this paper,we have investigated the emergence of an initial un-twisted magnetic flux rope based on three-dimensional(3 D)magneto-hydrodynamic(MHD)*** EB-like and UV burst-like activities successively appear in the U-shaped part of the undulating magnetic fields triggered by the Parker *** EB-like activity starts to appear earlier and lasts for about 80 *** minutes later,a much hotter UV burstlike event starts to appear and lasts for about 60 *** the direction vertical to the solar surface,both the EB and UV burst start in the low chromosphere,but the UV burst extends to a higher altitude in the up *** regions with apparent temperature increase in the EB and UV burst are both located inside the small twisted flux ropes generated in magnetic reconnection processes,which are consistent with the previous 2 D simulations that most hot regions are usually located inside the magnetic ***,the twisted flux rope corresponding to the EB is only strongly heated after it floats up to an altitude much higher than the reconnection site during that *** analyses show that the EB is heated by the shocks driven by the strong horizontal flows at two sides of the U-shaped magnetic *** twisted flux rope corresponding to the UV burst is heated by the driven magnetic reconnection process.

关键词： magnetic reconnection (magnetohydrodynamics)MHD shocks sun:heating sun:low solar atmosphere sun:magnetic flux emergence

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