论文标题
凯尔文·赫尔姆霍尔茨（Kelvin-Helmholtz
Current-sheet Oscillations Caused by Kelvin-Helmholtz Instability at the Loop Top of Solar Flares
论文作者
论文摘要
通常观察到振荡的磁性重新连接的磁重新连接的较长拉伸结构（CSS），但目前仍然令人困惑。基于高分辨率的2.5维MHD模拟磁重新连接，我们探索了CS振荡的形成机理。我们发现，在高度湍流的尖端区域的开尔文 - 螺旋不稳定性（KHI）激发了大振幅横向波。扰动以接近局部AlfVén速度的相位速度向上传播，从而导致我们观察到的CS振荡。尽管在繁殖较长距离后的扰动潮湿，但仍可以检测到CS振荡。就检测到的CS振荡而言，结合了差分发射测量技术，我们提出了一种测量CSS磁场强度及其高度分布的新方法。
Current sheets (CSs), long stretching structures of magnetic reconnection above solar flare loops, are usually observed to oscillate, their origins, however, are still puzzled at present. Based on a high-resolution 2.5-dimensional MHD simulation of magnetic reconnection, we explore the formation mechanism of the CS oscillations. We find that large-amplitude transverse waves are excited by the Kelvin-Helmholtz instability (KHI) at the highly turbulent cusp-shaped region. The perturbations propagate upward along the CS with a phase speed close to local Alfvén speed thus resulting in the CS oscillations we observe. Though the perturbations damp after propagating for a long distance, the CS oscillations are still detectable. In terms of detected CS oscillations, with a combination of differential emission measure technique, we propose a new method for measuring the magnetic field strength of the CSs and its distribution in height.
