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arXiv 2602.01117astro-ph.SR
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X类爆发日冕中出现的鱼骨状结构

Herringbone structures during an X-class eruptive flare

Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);State Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences(中国科学院国家空间科学中心太阳活动与空间天气国家重点实验室);Yunnan Observatories, Chinese Academy of Sciences(中国科学院云南天文台);Yunnan Key Laboratory of Solar Physics and Space Science(云南省太阳物理与空间科学重点实验室);School of Science, Nanjing University of Posts and Telecommunications(南京邮电大学理学院)

Qingmin Zhang, Zongjun Ning, Xingyao Chen, Wei Chen, Xiaoli Yan, Shuyue Li

AI总结:

研究发现X类日冕爆发中出现周期性鱼骨状结构,由CME驱动的激波间歇性加速电子形成。

摘要:

在本文中,我们报告了在X类爆发的剧烈阶段出现的近似周期性的鱼骨状结构,这些结构与2023年12月31日 eruptive prominence ejection 的明显加速阶段同时发生。 prominence 向东南方向非径向传播,具有约35′4的倾斜角。速度约为2852 km/s的快速日冕质抛射(CME)驱动了激波波和日冕EUV波。持续约4分钟的鱼骨状结构出现在一组类型II无线电爆发的初始阶段。频率范围20-70 MHz的鱼骨状结构特征为同时出现的正向漂移和反向漂移爆发,平均持续时间约为2.5秒和3.1秒。这些爆发的频率漂移率在1.3-9.4 MHz/s范围内,平均值分别为约3.6和4.1 MHz/s。产生鱼骨状结构的电子束速度估计为0.04-0.41c,正向漂移和反向漂移爆发的平均值分别为约0.23c和0.11c。粒子加速区域的高度估计为0.64-0.78 R_太阳以上,与激波形成时CME前缘的高度(约0.75 R_太阳)一致。在鱼骨状结构的无线电流量中发现了周期为17.5-21.3秒的近似周期性脉动,表明电子被CME驱动的激波间歇性加速。

英文摘要:

In this paper, we report quasi-periodic herringbone structures during the impulsive phase of an X-class flare, coinciding with the distinct acceleration phase of eruptive prominence ejection on 2023 December 31. The prominence propagates non-radially in the southeast direction with an inclination angle of $\sim$35$\fdg$4. The fast coronal mass ejection (CME) at a speed of $\sim$2852 km s$^{-1}$ drives a shock wave and a coronal EUV wave. The herringbone structures lasting for $\sim$4 minutes take place at the initial stage of a group of type II radio burst. The herringbones in the frequency range 20$-$70 MHz are characterized by simultaneous forward-drift and reverse-drift bursts with average durations of $\sim$2.5 s and $\sim$3.1 s. The frequency drift rates of these bursts fall in a range of 1.3$-$9.4 MHz s$^{-1}$ with average values of $\sim$3.6 and $\sim$4.1 MHz s$^{-1}$, respectively. The speeds of electron beams producing the herringbones are estimated to be 0.04$-$0.41 $c$, with average values of $\sim$0.23 $c$ and $\sim$0.11 $c$ for forward-drifting and reverse-drift bursts, respectively. The heights of particle acceleration regions are estimated to be 0.64$-$0.78 $R_{\sun}$ above the photosphere, which are consistent with the height of CME front ($\sim$0.75 $R_{\sun}$) when the shock forms. Quasi-periodic pulsations with periods of 17.5$-$21.3 s are found in the radio fluxes of herringbones, suggesting that electrons are accelerated by the CME-driven shock intermittently.

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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