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arXiv 2404.18092astro-ph.SR
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太阳爆发重联位置附近众多双向传播的等离子体团块

Numerous Bidirectionally Propagating Plasma Blobs near the Reconnection Site of a Solar Eruption

Zhenyong Hou, Hui Tian, Maria S. Madjarska, Hechao Chen, Tanmoy Samanta, Xianyong Bai, Zhentong Li, Yang Su, Wei Chen, Yuanyong Deng

AI总结:

本研究报告了太阳爆发耀斑电流片中108个双向传播等离子体团块的盘上观测,测量了其物理参数,表明等离子体不稳定性在能量释放中起重要作用。

摘要:

电流片是太阳爆发中常见的结构。然而,它仅在少数事件中被观测到,且其精细结构在太阳爆发期间的物理性质很少被研究。在此,我们报告一次盘上观测,显示108个紧凑的圆形或椭圆形亮结构,推测为等离子体团块,在约24分钟内沿耀斑电流片双向传播。从极紫外图像中,我们研究了耀斑峰值时间附近团块数量的时间变化。电流片连接耀斑环和爆发暗条。这些团块的宽度、持续时间、投影速度、温度和密度分别约为1.7±0.5 Mm、79±19 s、191±81 km/s、10^{6.4±0.1} K和10^{10.1±0.3} cm^{-3}。重联位置以≤69 km/s的速度上升。观测结果表明,等离子体不稳定性在太阳爆发的能量释放过程中起重要作用。

英文摘要:

Current sheet is a common structure involved in solar eruptions. However, it is observed in minority of the events and the physical properties of its fine structures during a solar eruption are rarely investigated. Here, we report an on-disk observation that displays 108 compact, circular or elliptic bright structures, presumably plasma blobs, propagating bidirectionally along a flare current sheet during a period of $\sim$24 minutes. From extreme ultraviolet images, we have investigated the temporal variation of the blob number around the flare peak time. The current sheet connects the flare loops and the erupting filament. The width, duration, projected velocity, temperature, and density of these blobs are $\sim$1.7$\pm$0.5\,Mm, $\sim$79$\pm$57\,s, $\sim$191$\pm$81\,\kms, $\sim$10$^{6.4\pm0.1}$ K, and $\sim$10$^{10.1\pm0.3}$ cm$^{-3}$, respectively. The reconnection site rises with a velocity of $\leqslant$69\,\kms. The observational results suggest that plasmoid instability plays an important role in the energy release process of solar eruptions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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