质量加载和卸载引起的太阳磁通量绳的约束灾变和爆发灾变
Confined and eruptive catastrophes of solar magnetic flux ropes caused by mass loading and unloading
摘要：
日冕磁通量绳是太阳大规模爆发活动的核心结构，对日地系统产生巨大的影响。以往的研究表明，日冕磁绳系统的磁特性变化可能导致磁绳的灾变，从而引发太阳爆发活动。由于磁通绳的总质量也起着重要的作用，在稳定的绳子，我们使用2.5维磁流体动力学（MHD）的数值模拟在这封信中调查如何磁通绳演变为它的总质量变化。结果表明，在磁绳系统中，当磁绳的总质量降低时，磁绳系统会发生向上的突变，即磁绳向上跳跃，释放出磁能量。这表明，质量卸载过程可以启动磁绳的爆发。此外，当系统不太扩散时，也有一个向下（受限）的灾难，这可能是由质量加载过程引起的，通过该过程，总质量累积。然而，在向下的灾难期间，磁能增加，这表明质量加载过程可能导致有限的活动，这可能有助于在日冕爆发开始之前储存能量。
英文摘要：
It is widely accepted that coronal magnetic flux ropes are the core structures of large-scale solar eruptive activities, which inflict dramatic impacts on the solar-terrestrial system. Previous studies have demonstrated that varying magnetic properties of a coronal flux rope system could result in a catastrophe of the rope, which may trigger solar eruptive activities. Since the total mass of a flux rope also plays an important role in stabilizing the rope, we use 2.5-dimensional magnetohydrodynamic (MHD) numerical simulations in this letter to investigate how a flux rope evolves as its total mass varies. It is found that an unloading process that decreases the total mass of the rope could result in an upward (eruptive) catastrophe in the flux rope system, during which the rope jumps upward and the magnetic energy is released. This indicates that mass unloading processes could initiate the eruption of the flux rope. Moreover, when the system is not too diffusive, there is also a downward (confined) catastrophe that could be caused by mass loading processes, via which the total mass accumulates. The magnetic energy, however, is increased during the downward catastrophe, indicating that mass loading processes could cause confined activities that may contribute to the storage of energy before the onset of coronal eruptions.
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