论文标题
由磁通绳的非rad式喷发引起的横向冠状环振荡
Transverse Coronal-Loop Oscillations Induced by the Non-radial Eruption of a Magnetic Flux Rope
论文作者
论文摘要
We investigate the transverse coronal-loop oscillations induced by the eruption of a prominence-carrying flux rope on 7 December 2012. The flux rope originating from NOAA Active Region (AR) 11621 was observed in EUV wavelengths by the SDO/AIA and in H$α$ line center by the ground-based telescope at the BBSO.通量绳的早期演变分为两个步骤：以$ \ $ \ $ 230 \，km \，s $^{ - 1} $的速度缓慢上升阶段，以$ \ $ \ $ 706 \，km \，km \，s $^{ - 1} $的速度快速上升阶段。喷发产生C5.8耀斑，快速上升的发作与耀斑的HXR峰时间一致。嵌入式突出性的较低速度约为$ \ $ 452 \，km \，s $^{ - 1} $。在通量绳的早期喷发期间，附近的冠状环受到干扰，并在水平和垂直方向上经历独立的扭结模式振荡。水平方向的振荡的初始幅度约为$ \ $ 3.1 \，mm，$ \ $ \ $ \ $ 294 \，秒，$ \ $ \ $ \ $ \ $ 645 \，秒。它在171 \，Å中最引人注目，持续三到四个周期。垂直方向上的振荡主要观察到171、193和211 \，Å。初始振幅在于3.4 \， - \，5.2 \，mm的范围，平均值为4.5 \，mm。这些周期在407 \，秒和441 \秒之间，平均值为423 \秒。振荡正在阻尼，持续近四个周期。阻尼时间位于570 \， - \，1012 \，秒的范围，平均值为741 \，秒。假设垂直振荡环的半圆形形状，我们根据其高度计算回路长度。使用观察到的时期，我们执行冠状动脉学并估算内部Alfvén速度（988 \， - \，1145 \，km \，km \，s $^{ - 1} $）和磁场强度（12 \ \， - \， - \，43 \，g）。
We investigate the transverse coronal-loop oscillations induced by the eruption of a prominence-carrying flux rope on 7 December 2012. The flux rope originating from NOAA Active Region (AR) 11621 was observed in EUV wavelengths by the SDO/AIA and in H$α$ line center by the ground-based telescope at the BBSO. The early evolution of the flux rope is divided into two steps: a slow rise phase at a speed of $\approx$230\,km\,s$^{-1}$ and a fast rise phase at a speed of $\approx$706\,km\,s$^{-1}$. The eruption generates a C5.8 flare and the onset of the fast rise is consistent with the HXR peak time of the flare. The embedded prominence has a lower speed of $\approx$452\,km\,s$^{-1}$. During the early eruption of the flux rope, the nearby coronal loops are disturbed and experience independent kink-mode oscillations in the horizontal and vertical directions. The oscillation in the horizontal direction has an initial amplitude of $\approx$3.1\,Mm, a period of $\approx$294\,seconds, and a damping time of $\approx$645\,seconds. It is most striking in 171\,Å and lasts for three to four cycles. The oscillations in the vertical directions are observed mainly in 171, 193, and 211\,Å. The initial amplitudes lie in the range of 3.4\,--\,5.2\,Mm, with an average value of 4.5\,Mm. The periods are between 407\,seconds and 441\,seconds, with an average value of 423\,seconds. The oscillations are damping and last for nearly four cycles. The damping times lie in the range of 570\,--\,1012\,seconds, with an average value of 741\,seconds. Assuming a semi-circular shape of the vertically oscillating loops, we calculate the loop lengths according to their heights. Using the observed periods, we carry out coronal seismology and estimate the internal Alfvén speeds (988\,--\,1145\,km\,s$^{-1}$) and the magnetic-field strengths (12\,--\,43\,G) of the oscillating loops.
