摘要
重点研究了2024年5月10—11日特大地磁暴事件的系列太阳爆发的“先锋官”,即发生在5月8日的X1.0级耀斑的触发过程。多波段观测显示,该事件的太阳源区包含2个密不可分的活动区AR13668和AR13664。活动核心区存在4个暗条,相应的高温波段表现为4组亮的热冕环结构,对应非线性无力场模型中的1个扭缠磁绳和3个弱扭缠的剪切磁拱。分析X1.0级耀斑的复杂触发过程,发现其伴随2个M级耀斑和2个热通道的爆发。发生在第1个M级耀斑期间的热通道HC1的爆发为热通道HC2形成后便迅速进入快速上升相提供了有利条件,而HC2的快速上升又推进了HC1的快速爆发,最终二者合并为一体成功抛出后,形成一个晕状日冕物质抛射。多波段观测和非线性无力场联合分析表明,热通道HC2的形成是光球磁对消引发的2组剪切磁拱的缰绳截断磁重联所致,该过程发生在第2个M级耀斑期间,随后热通道HC2的快速上升触发了X1.0级耀斑的开始。揭示了2024年5月特大地磁暴的首个日面爆发触发的复杂过程,即多个耀斑和热通道爆发的耦合,推动对极端空间天气事件日面爆发的触发过程的深入理解。
This article focuses on the triggering process of an X1.0 class flare that occurred on May 8,which is the first event in a series of solar eruptions related to the massive geomagnetic storm event on May 10-11,2024.Multi-wavelength observations show that the solar source region of this event is composed of two closely-related active regions,AR 13668 and AR 13664.There are four filaments in the core area of the activity,and the corresponding high-temperature observations exhibit four sets of bright corona loops,corresponding to one twisted magnetic flux rope and three weakly twisted sheared magnetic arcades in the nonlinear force-free field model.The complex triggering process of X1.0 class flares is analyzed,and it is found that they are associated with the eruption of two M-class flares and two hot channels.The eruption of the hot channel HC1 during the first M-class flare provides favorable conditions for the fast rise of the hot channel HC2 after its formation,which in turn propels the fast rise of HC1.Eventually,the two hot channels merge and successfully erupt,forming a halo coronal mass ejections.The joint analysis of multi-wavelength observations and nonlinear force-free field shows that the formation of the hot channel HC2 is caused by the tether-cutting magnetic reconnection of two sheared magnetic arcades triggered by the magnetic flux cancellation.This process occurs during the second M-class flare,and the fast rise of the hot channel HC2 subsequently triggers the onset of the X1.0 class flare.The study reveals the complex triggering process of the first X-class solar flare related to the massive geomagnetic storm in 2024 May,which involves coupling between multiple flares and hot channel eruptions,deepening our understanding of the triggering process of extreme space weather events in the source region.
作者
宿英娜
欧雨迪
张潇文
万双峰
滕伟霖
季海生
SU Yingna;OU Yudi;ZHANG Xiaowen;WAN Shuangfeng;TENG Weilin;JI Haisheng(Key Laboratory for Dark Matter and Space Science,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China;College of Letters and Science,University of California,Berkeley 94720,USA)
出处
《科技导报》
北大核心
2025年第16期105-113,共9页
Science & Technology Review
基金
中国科学院基础与交叉前沿科研先导专项(B类)(XDB0560000)
国家重点研发计划项目(2022YFF0503001,2021YFA1600502)
国家自然科学基金委员会面上项目(12173092)。
关键词
地磁暴
太阳耀斑
日冕物质抛射
热通道
磁场
geomagnetic storm
solar flare
coronal mass ejection
hot channel
magnetic field
