A Unified Model of Solar Prominence Formation
A Unified Model of Solar Prominence Formation
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DOI：
10.3847/2041-8213/abfbe0
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
C. Huang;J. Guo;Y. Ni;A. Xu;P. Chen
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文献类型：
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作者：
C. Huang;J. Guo;Y. Ni;A. Xu;P. Chen
目前已经提出了几种解释太阳暗条或暗条形成的机制，其中直接注入模型和蒸发-凝结模型是最流行的两种。在直接注入模型中，冷等离子体从色球层沿沿着磁力线喷射到日冕中;在蒸发-凝结模型中，冷色球层等离子体被加热到一百万度以上并蒸发到日冕中，在那里积累的等离子体最终达到热不稳定或不平衡，从而凝结成冷等离子体。在本文中，我们试图统一这两种机制：暗条形成的本质是色球层的局部加热。如果加热发生在低色球层，则增强的气体压力推动高色球层的冷等离子体向上移动到日冕，这一过程表现为直接注入模型。如果加热发生在上层色球层，局部等离子体被加热到1-2百万度，并蒸发到日冕中。后来，等离子体凝结形成日珥。这种过程表现为蒸发-冷凝模型。通过辐射流体动力学模拟，我们证实了这两种被广泛接受的太阳双折射形成机制确实可以统一在这样一个单一的框架中。一个特殊的情况下，也被发现在喷射和蒸发冷凝过程一起发生。
Several mechanisms have been proposed to account for the formation of solar prominences or filaments, among which direct injection and evaporation–condensation models are the two most popular ones. In the direct injection model, cold plasma is ejected from the chromosphere into the corona along magnetic field lines; in the evaporation–condensation model, the cold chromospheric plasma is heated to over a million degrees and is evaporated into the corona, where the accumulated plasma finally reaches thermal instability or nonequilibrium so as to condensate to cold prominences. In this paper, we try to unify the two mechanisms: The essence of filament formation is the localized heating in the chromosphere. If the heating happens in the lower chromosphere, the enhanced gas pressure pushes the cold plasma in the upper chromosphere to move up to the corona, such a process is manifested as the direct injection model. If the heating happens in the upper chromosphere, the local plasma is heated to 1–2 million degrees, and is evaporated into the corona. Later, the plasma condensates to form a prominence. Such a process is manifested as the evaporation–condensation model. With radiative hydrodynamic simulations we confirmed that the two widely accepted formation mechanisms of solar prominences can really be unified in such a single framework. A particular case is also found where both injection and evaporation–condensation processes occur together.