Thermal responses in a coronal loop maintained by wave heating mechanisms
Thermal responses in a coronal loop maintained by wave heating mechanisms
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DOI：
10.1093/mnras/sty490
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发表时间：
2017-12
影响因子：
4.8
通讯作者：
Takuma Matsumoto
中科院分区：
文献类型：
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作者：
Takuma Matsumoto
进行完整的 3 维可压缩磁流体动力学 (MHD) 模拟，以研究日冕环对 MHD 波动态耗散过程的热响应。当环路的足点受到随机且连续的作用力时，MHD 波就会被激发并向上传播。然后，随着波能的消散，自然产生高温电晕。激发的波包在磁冠上方变得非线性，并且波能级联到更小的空间尺度。此外，反向传播的 Alfv\'{e}n 波包之间的碰撞会增加加热速率，导致脉冲温度升高。我们的模型表明，波加热回路中的加热事件可以是类似纳米耀斑的，因为它们在空间上是局部的并且在时间上是间歇性的。
A full 3-dimensional compressible magnetohydrodynamic (MHD) simulation is conducted to investigate the thermal responses of a coronal loop to the dynamic dissipation processes of MHD waves. When the foot points of the loop are randomly and continuously forced, the MHD waves become excited and propagate upward. Then, a high-temperature corona is produced naturally as the wave energy dissipates. The excited wave packets become non-linear just above the magnetic canopy, and the wave energy cascades into smaller spatial scales. Moreover, collisions between counter-propagating Alfv\'{e}n wave packets increase the heating rate, resulting in impulsive temperature increases. Our model demonstrates that the heating events in the wave-heated loops can be nanoflare-like in the sense that they are spatially localized and temporally intermittent.