Probing Current Sheet Instabilities from Flare Ribbon Dynamics
Probing Current Sheet Instabilities from Flare Ribbon Dynamics
复制标题
DOI：
10.3847/1538-4357/ac256f
复制
发表时间：
2021-09
期刊：
影响因子：
--
通讯作者：
R. French;S. Matthews;I. Jonathan Rae;Andrew W. Smith
中科院分区：
文献类型：
--
作者：
R. French;S. Matthews;I. Jonathan Rae;Andrew W. Smith
需要当前薄片不稳定性的存在，例如撕裂模式不稳定性，来解释观察到的太阳耀斑中能量释放的速率。对当前片层动力学的洞察可以通过耀斑带子结构的行为来揭示，因为磁重联加速粒子沿着新重新连接的磁力线进入色球层以标记耀斑足点。因此，功能区中的行为可用于探测当前工作表中发生的过程。在这项研究中，我们使用高节奏（1.7秒）IRIS狭缝颌成像仪观测来探索耀斑带上关键空间尺度的增长和演化——这是由2016年12月6日一次小型太阳耀斑当前片层的动力学产生的。将空间尺度增长与Si iv非热速度的分析结合起来，我们拼凑出了这一受限事件的耀斑爆发的时间线，并提供了触发级联和逆事件的撕裂模式不稳定性的证据。级联到与等离子体湍流一致的功率谱。
The presence of current sheet instabilities, such as the tearing mode instability, are needed to account for the observed rate of energy release in solar flares. Insights into these current sheet dynamics can be revealed by the behavior of flare ribbon substructure, as magnetic reconnection accelerates particles down newly reconnected field lines into the chromosphere to mark the flare footpoints. Behavior in the ribbons can therefore be used to probe processes occurring in the current sheet. In this study, we use high-cadence (1.7 s) IRIS Slit Jaw Imager observations to probe for the growth and evolution of key spatial scales along the flare ribbons—resulting from dynamics across the current sheet of a small solar flare on 2016 December 6. Combining analyses of spatial scale growth with Si iv nonthermal velocities, we piece together a timeline of flare onset for this confined event, and provide evidence of the tearing mode instability triggering a cascade and inverse cascade toward a power spectrum consistent with plasma turbulence.