在多波长观测中看到的明亮日冕下降流：分叉通量绳的证据？
A bright coronal downflow seen in multi-wavelength observations: evidence of a bifurcating flux-rope?
摘要：
目的：研究2000年3月5日与爆发性日冕物质抛射日冕物质抛射有关的明亮日冕下行流的起源和特征。方法：本研究扩展了Tripathi等人的研究（A&A，v. 449，pp. 369)基于极紫外成像望远镜（EIT），软X射线望远镜（SXT）和大角度光谱日冕仪（LASCO）的观测。我们将这些结果与莫纳罗亚太阳天文台（MLSO）的H $α$和Mk 4日冕仪的观测结果相结合。组合的数据集涵盖了广泛的温度范围，以及从太阳表面到30 R $_{\sun}$的连续观测。结果：下降气流在大约1.6 R $_{\sun}$处开始，并且包含热气体和冷气体。在H $α$和Mk 4日冕仪以及EIT和SXT中观察到向下流动，并且大约是同空间和同时间的，提供了多热等离子体的证据。H $α$和Mk 4图像显示了接近向下流动开始位置的尖形结构。Mk4观测结果表明，在早期阶段的下降流的速度大大高于自由落体的速度，这意味着在下降流开始的高度附近有一个强烈的向下加速。结论：下降流的起源很可能是在喷发的磁通绳内部发生的磁重联，导致了它的分叉。
英文摘要：
Aims: To study the origin and characteristics of a bright coronal downflow seen after a coronal mass ejection associated with erupting prominences on 5 March 2000. Methods: This study extends that of Tripathi et al. (A&A, v. 449, pp. 369) based on the Extreme-ultraviolet Imaging Telescope (EIT), the Soft X-ray Telescope (SXT) and the Large Angle Spectrometric Coronagraph (LASCO) observations. We combined those results with an analysis of the observations taken by the H$α$ and the Mk4 coronagraphs at the Mauna Loa Solar Observatory (MLSO). The combined data-set spans a broad range of temperature as well as continuous observations from the solar surface out to 30 R$_{\sun}$. Results: The downflow started at around 1.6R$_{\sun}$ and contained both hot and cold gas. The downflow was observed in the H$α$ and the Mk4 coronagraphs as well as the EIT and the SXT and was approximately co-spatial and co-temporal providing evidence of multi-thermal plasma. The H$α$ and Mk4 images show cusp-shaped structures close to the location where the downflow started. Mk4 observations reveal that the speed of the downflow in the early phase was substantially higher than the free-fall speed, implying a strong downward acceleration near the height at which the downflow started. Conclusions: The origin of the downflow was likely to have been magnetic reconnection taking place inside the erupting flux rope that led to its bifurcation.
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