在横波作用下多股线圈的不稳定性和不存在性
The instability and non-existence of multi-stranded loops, when driven by transverse waves
摘要：
近年来，在太阳大气的各个层中都观测到了无所不在的横波。日冕环通常被建模为单个链的集合，以解释它们的热行为和外观。我们进行了三维理想MHD模拟，研究了连续小振幅横向足点驱动对由股线组成的冠状环内部结构的影响。输出还使用FoMo转换为合成图像，对应于AIA 171 A和193 A通带。我们表明，多股循环不再存在于传统意义上的词，因为等离子体是有效地混合垂直于磁场，与开尔文-亥姆霍兹不稳定性作为主要机制。我们的模拟的最终产品是混合循环的密度结构在很大范围内的规模，类似于幂律。因此，多股环是不稳定的驱动横波，这引起了强烈的质疑的可用性和适用性的冠状环模型组成的独立股。
英文摘要：
In recent years, omni-present transverse waves have been observed in all layers of the solar atmosphere. Coronal loops are often modeled as a collection of individual strands, in order to explain their thermal behaviour and appearance. We perform 3D ideal MHD simulations to study the effect of a continuous small amplitude transverse footpoint driving on the internal structure of a coronal loop composed of strands. The output is also converted to synthetic images, corresponding to the AIA 171 A and 193 A passbands, using FoMo. We show that the multi-stranded loop ceases to exist in the traditional sense of the word, because the plasma is efficiently mixed perpendicularly to the magnetic field, with the Kelvin-Helmholtz instability acting as the main mechanism. The final product of our simulation is mixed loop with density structures on a large range of scales, resembling a power-law. Thus, multi-stranded loops are unstable to driving by transverse waves, and this raises a strong doubt on the usability and applicability of coronal loop models consisting of independent strands.
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