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

作　　者：Guan-Chong Cheng Lei Ni Ya-Jie Chen Udo Ziegler Jun Lin 程冠冲;倪蕾;陈亚杰;Udo Ziegler;林隽(Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Key Laboratory of Solar Activity,National Astronomical Observatories,Beijing 100101,China;Center for Astronomical Mega-Science,Chinese Academy of Sciences,Beijing 100101,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China;Astrophysikalisches Institut Potsdam D-14482 Potsdam,Germany)

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]CAS Key Laboratory of Solar Activity,National Astronomical Observatories,Beijing 100101,China [4]Center for Astronomical Mega-Science,Chinese Academy of Sciences,Beijing 100101,China [5]School of Earth and Space Sciences,Peking University,Beijing 100871,China [6]Astrophysikalisches Institut Potsdam D-14482 Potsdam,Germany

出　　处：《Research in Astronomy and Astrophysics》2021年第9期163-179,共17页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,Grant Nos.11973083 and 11933009);the Strategic Priority Research Program of CAS(Grant Nos.XDA17040507 and QYZDJ-SSWSLH012);the grants associated with the Yunling Scholar Project of the Yunnan Province and the Yunnan Province Scientist Workshop of Solar Physics;the Youth Innovation Promotion Association CAS 2017;the Applied Basic Research of Yunnan Province in China(Grant 2018FB009);the Yunnan Ten-Thousand Talents Plan-Young top talents;the project of the Group for Innovation of Yunnan Province(Grant 2018HC023);the Yunnan Ten-Thousand Talents Plan-Yunling Scholar Project;the Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund(NSFC015-460,NSFC2015-463,the second phase);Computational Solar Physics Laboratory of Yunnan Observatories,the key Laboratory of Solar Activity(Grant KLSA202103)。

摘　　要：Ellerman bombs(EBs)and ultraviolet(UV)bursts are common brightening phenomena,which are usually generated in the low solar atmosphere of emerging flux regions.In this paper,we have investigated the emergence of an initial un-twisted magnetic flux rope based on three-dimensional(3 D)magneto-hydrodynamic(MHD)simulations.The EB-like and UV burst-like activities successively appear in the U-shaped part of the undulating magnetic fields triggered by the Parker instability.The EB-like activity starts to appear earlier and lasts for about 80 seconds.Six minutes later,a much hotter UV burstlike event starts to appear and lasts for about 60 seconds.Along 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 chromosphere.The 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 islands.However,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 period.Our analyses show that the EB is heated by the shocks driven by the strong horizontal flows at two sides of the U-shaped magnetic fields.The 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 

分 类 号：P182[天文地球—天文学]