日冕下沉气流的磁洗牌
Magnetic shuffling of coronal downdrafts
摘要：
在磁化的大气中，被磁化的碎片化的下行流是普遍存在的，最近在太阳爆发后的一次观测中得到了解决。我们研究了磁场对受限流传播的可能反向效应。我们比较了两个3D MHD模拟稠密超音速等离子体斑点沿日冕磁通量管下落。在一种情况下，斑点严格地沿着磁力线运动;在另一种情况下，斑点的初始速度与磁场不完全一致，磁场较弱。对齐的液滴在沿着管流动时保持紧凑，具有所产生的冲击。未对准的斑点被磁力线的混乱洗牌破坏和合并，并被构造成更细的细丝;阿尔芬波前与密集移动波前前面的激波一起产生。如果向下流动的等离子体碎片的运动与场线不对准，则它们可以混乱且有效地混合，这具有广泛的含义，例如，原恒星中的圆盘吸积、日冕爆发和雨。
英文摘要：
Channelled fragmented downflows are ubiquitous in magnetized atmospheres, and have been recently addressed from an observation after a solar eruption. We study the possible back-effect of the magnetic field on the propagation of confined flows. We compare two 3D MHD simulations of dense supersonic plasma blobs downfalling along a coronal magnetic flux tube. In one, the blobs move strictly along the field lines; in the other, the initial velocity of the blobs is not perfectly aligned to the magnetic field and the field is weaker. The aligned blobs remain compact while flowing along the tube, with the generated shocks. The misaligned blobs are disrupted and merged by the chaotic shuffling of the field lines, and structured into thinner filaments; Alfven wave fronts are generated together with shocks ahead of the dense moving front. Downflowing plasma fragments can be chaotically and efficiently mixed if their motion is misaligned to field lines, with broad implications, e.g., disk accretion in protostars, coronal eruptions and rain.
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