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arXiv 1607.01329astro-ph.SR
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脉冲加热太阳和恒星日冕环中的等离子体晃动

Plasma sloshing in pulse-heated solar and stellar coronal loops

F. Reale

摘要:

有证据表明,日冕加热是高度间歇性的,耀斑是高能量的极端。热脉冲的性质难以约束。这里的流体动力学环路模拟表明,几个大振幅的振荡(约20%的密度)被触发的耀斑光变曲线,如果热脉冲的持续时间是短的声音的耀斑环路的交叉时间。其原因是等离子体没有足够的时间来达到压力平衡期间的加热和旅行的压力锋发展。典型的日冕环的周期是几分钟,由衰变阶段的声音穿越时间决定。长周期、大振幅的振荡使其不同于典型的MHD波。这种诊断可以应用于太阳和恒星耀斑的观测和未来的高分辨率非耀斑环的观测。

英文摘要:

There is evidence that coronal heating is highly intermittent, and flares are the high energy extreme. The properties of the heat pulses are difficult to constrain. Here hydrodynamic loop modeling shows that several large amplitude oscillations (~ 20% in density) are triggered in flare light curves if the duration of the heat pulse is shorter that the sound crossing time of the flaring loop. The reason is that the plasma has not enough time to reach pressure equilibrium during the heating and traveling pressure fronts develop. The period is a few minutes for typical solar coronal loops, dictated by the sound crossing time in the decay phase. The long period and large amplitude make these oscillations different from typical MHD waves. This diagnostic can be applied both to observations of solar and stellar flares and to future observations of non-flaring loops at high resolution.

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