Simulations of Prominence Eruption Preceded by Large-amplitude Longitudinal Oscillations and Draining
Simulations of Prominence Eruption Preceded by Large-amplitude Longitudinal Oscillations and Draining
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DOI：
10.3847/1538-4357/ab9d7f
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Yuhong Fan
中科院分区：
文献类型：
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作者：
Yuhong Fan
我们提出了磁流体动力学（MHD）模拟的演化，从准平衡爆发的连续性形成扭曲的日冕通量绳下的日冕流光。我们比较了有和没有日珥凝聚形成的情况，以及日珥凝聚形成但我们人为地启动日珥的排出的情况。我们发现，日珥的重量有一个显着的稳定性的磁通绳，可以显着增加失去平衡的高度。可以通过启动日珥物质的排出来使磁绳更早地喷发。我们还进行了模拟，其中大振幅的纵向振荡的日珥激发在准静态阶段。我们发现，重力沿着磁场线是主要的恢复力的振荡，根据“钟摆模型”，虽然振荡周期是高的（约10%-40%），从模型的估计，因为动态变形的磁场线下降期间的振荡。振荡周期也被发现是稍小的下部的日珥在较深的倾角相比，在较浅的倾角的上部。振荡在大约两到三个周期后迅速衰减，随后是日珥的消耗和日珥的最终爆发。然而，我们没有发现一个显着的增强日珥排水和更早的爆发与日珥振荡的激发相比，没有的情况下。
We present magnetohydrodynamic (MHD) simulations of the evolution from quasi-equilibrium to eruption of a prominence-forming twisted coronal flux rope under a coronal streamer. We have compared the cases with and without the formation of prominence condensations, as well as the case where prominence condensations form but we artificially initiate the draining of the prominence. We find that the prominence weight has a significant effect on the stability of the flux rope and can significantly increase the loss-of-equilibrium height. The flux rope can be made to erupt earlier by initiating draining of the prominence mass. We have also performed a simulation where large-amplitude longitudinal oscillations of the prominence are excited during the quasi-static phase. We find that the gravity force along the magnetic field lines is the major restoring force for the oscillations, in accordance with the “pendulum model,” although the oscillation periods are higher (by about 10%–40%) than estimated from the model because of the dynamic deformation of the field line dips during the oscillations. The oscillation period is also found to be slightly smaller for the lower part of the prominence in the deeper dips compared to the upper part in the shallower dips. The oscillations are quickly damped out after about two to three periods and are followed by prominence draining and the eventual eruption of the prominence. However, we do not find a significant enhancement of the prominence draining and earlier onset of eruption with the excitation of the prominence oscillations compared to the case without.