发表机构
University of Oslo; Rosseland Centre for Solar Physics, University of Oslo; Lockheed Martin Solar & Astrophysics Laboratory; SETI Institute; Instituto de Astrofísica de Canarias; Universidad de La Laguna; Université Paris-Saclay; Université Paris Cité; CEA; CNRS（奥斯陆大学; 奥斯陆大学罗斯兰德太阳物理中心; 洛马太阳与天体物理学实验室; 搜寻地外文明研究所; 加那利群岛天体物理研究所; 拉帕尔马大学; 巴黎萨克雷大学; 巴黎西岱大学; 法国原子能和替代能源委员会; 法国国家科学研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过多仪器协同观测，发现太阳大气中与热紫外爆发相关的等离子体团形成证据，揭示磁重联驱动的多热态爆发可达百万开尔文温度。
AI 中文摘要
太阳大气中的磁重联驱动着诸如埃勒曼炸弹、紫外爆发和日浪等高能现象。我们利用瑞典1米太阳望远镜（SST）、界面区成像光谱仪（IRIS）、太阳动力学天文台（SDO）和日出卫星/X射线望远镜（XRT）的协同观测，分析了一个具有强烈磁通量浮现的活动区。该区域表现出长时间的紫外爆发活动、多次埃勒曼炸弹的出现以及日浪的反复抛射。色球成像显示存在一个穹顶状结构，横跨在磁通量浮现的区域之上。弯曲的色球纤维与IRIS 1400埃通道中紫外爆发的明亮且同样弯曲的延伸部分密切相关。我们观测到在H-beta谱线中沿弯曲纤维形成亮片的事件，该亮片随后碎裂成等离子体团状斑点，其峰值发射具有+43公里/秒的多普勒偏移。同一区域的IRIS Si IV谱线显示出复杂且非高斯的谱线轮廓，呈现出向高多普勒偏移的不对称延伸。一些轮廓具有清晰的分量，在标称谱线中心两侧的多普勒偏移超过150公里/秒。光学薄的SDO/AIA通道（包括94埃）显示出爆发间歇性和重复性的发生。发射测量和滤光片比分析表明，该爆发是多热态的，可以达到超过1百万开尔文的温度。AIA和日出卫星/XRT的观测揭示了爆发/穹顶系统的局部极紫外和软X射线对应体，支持存在本质上多热态的等离子体，其温度达到日冕温度，甚至可能达到数百万开尔文。
英文摘要
Magnetic reconnection in the solar atmosphere drives energetic phenomena such as Ellerman bombs, UV bursts, and surges. We used coordinated observations from the Swedish 1-m Solar Telescope (SST), IRIS, SDO, and the Hinode/X-ray Telescope (XRT) to analyze an active region with strong magnetic flux emergence. This region displayed long duration UV burst activity, occurrence of multiple Ellerman bombs, and recurrent ejection of surges. Chromospheric imaging show sthe presence of a dome-like structure that overarched the region where magnetic flux was emerging. The curved chromospheric fibrils were closely associated with bright and similarly curved extensions from a UV burst in the IRIS 1400 A channel. We observed an episode of formation of a bright sheet along the curved fibrils in H-beta that subsequently fragmented into plasmoid-like blobs with peak emission at a Doppler offset of +43 km/s. IRIS Si IV lines in the same region show complex and non-Gaussian line profiles that display asymmetric extensions to high Doppler offsets. Some profiles have clear components with Doppler offsets in excess of 150 km/s on both sides of the nominal line center. The optically thin SDO/AIA channels, including 94 A, show intermittent and repeated occurrences of the burst. Emission measure and filter ratio analysis indicate that the burst is multi-thermal and can attain temperatures beyond 1 MK. AIA and Hinode/XRT observations reveal a localized EUV and soft-X-ray counterpart of the burst/dome system, supporting the presence of intrinsically multithermal plasma that reaches coronal, and likely multi-MK, temperatures.
CommentsAccepted for publication in A&A. Includes links to movies associated with figures
