arXiv 2301.090122023-01-21astro-ph.SRphysics.space-ph

具有热不平衡的太阳日冕等离子体中慢磁声波和熵波的稳定性

Stability of slow magnetoacoustic and entropy waves in the solar coronal plasma with thermal misbalance

Dmitrii Y. Kolotkov, Valery M. Nakariakov, Joseph B. Fihosy

备注：: Accepted for publication in the Physics journal

摘要：

日冕中扰动的热平衡对压缩扰动的反作用，也称为波致热不平衡效应，已知会导致热不稳定性，这主要是日冕精细热结构形成的原因。我们研究的磁场和场对准的热传导在触发不稳定性的慢磁声和熵波在静态和热的活动区环路，引起的热不平衡的作用。磁场的影响占包括它在一个猜测的日冕加热函数的参数化，和有限的等离子体参数$β$，在一阶薄通量管近似。热传导倾向于稳定慢模式和熵模式，扩大了合理的日冕加热功能的间隔，允许存在一个热稳定的日冕。这种效应在热循环中最为明显。相反，熵波的稳定性被发现是不敏感的可能依赖的日冕加热功能的磁场，慢波保持稳定，只有某些功能形式的这种依赖，开辟了未来的地震诊断的前景。

英文摘要：

The back-reaction of the perturbed thermal equilibrium in the solar corona on compressive perturbations, also known as the effect of wave-induced thermal misbalance, is known to result in thermal instabilities chiefly responsible for the formation of fine thermal structuring of the corona. We study the role of the magnetic field and field-aligned thermal conduction in triggering instabilities of slow magnetoacoustic and entropy waves in quiescent and hot active region loops, caused by thermal misbalance. Effects of the magnetic field are accounted for by including it in the parametrisation of a guessed coronal heating function, and the finite plasma parameter $β$, in terms of the first-order thin flux tube approximation. Thermal conduction tends to stabilise both slow and entropy modes, broadening the interval of plausible coronal heating functions allowing for the existence of a thermodynamically stable corona. This effect is most pronounced for hot loops. In contrast to entropy waves, the stability of which is found to be insensitive to the possible dependence of the coronal heating function on the magnetic field, slow waves remain stable only for certain functional forms of this dependence, opening up perspectives for its seismological diagnostics in future.

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