论文标题
在冠状环扩展过程中首次检测横向垂直振荡
First detection of transverse vertical oscillation during the expansion of coronal loops
论文作者
论文摘要
在这封信中，我们对2029年1月20日活跃地区的M5.5级喷发耀斑进行了详细分析。热通道的喷发产生了快速的冠状质量弹射（CME）和圆顶形状的极端粉丝（EUV），以740 $ - $ 860 km $ 860 km $ s $ s $ s $ s $ s $^$^$^$^$^{1}。 CME与II型无线电爆发有关，这意味着EUV波是快速模式冲击波。在冲动阶段，耀斑在EUV，硬X射线和无线电波长中显示出准周期性搏动（QPP）。 QPP的周期范围从18 s到113 s，表明释放耀斑能量，非热电子通过多个时间尺度间歇性加速。 EUV波与低洼邻近冠状环（ACL）之间的相互作用导致ACL的收缩，扩张和横向垂直振荡。 171、193和211Å的收缩速度高于304Å中的收缩速度。振荡周期分别为304Å和171Å的253 s和275 s。提出了一种新方案来解释互动。解释耀斑芯上方上覆的冠状环的收缩和振荡的方程式也可以解释ACL的扩张和振荡，这表明这两种现象本质上是相同的。
In this Letter, we perform a detailed analysis of the M5.5-class eruptive flare occurring in active region 12929 on 2022 January 20. The eruption of a hot channel generates a fast coronal mass ejection (CME) and a dome-shaped extreme-ultraviolet (EUV) wave at speeds of 740$-$860 km s$^{-1}$. The CME is associated with a type II radio burst, implying that the EUV wave is a fast-mode shock wave. During the impulsive phase, the flare shows quasi-periodic pulsations (QPPs) in EUV, hard X-ray, and radio wavelengths. The periods of QPPs range from 18 s to 113 s, indicating that flare energy is released and nonthermal electrons are accelerated intermittently with multiple time scales. The interaction between the EUV wave and low-lying adjacent coronal loops (ACLs) results in contraction, expansion, and transverse vertical oscillation of ACLs. The speed of contraction in 171, 193, and 211 Å is higher than that in 304 Å. The periods of oscillation are 253 s and 275 s in 304 Å and 171 Å, respectively. A new scenario is proposed to explain the interaction. The equation that interprets the contraction and oscillation of the overlying coronal loops above a flare core can also interpret the expansion and oscillation of ACLs, suggesting that the two phenomena are the same in essence.
