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arXiv 1706.03090astro-ph.SR
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耀斑-CME电流片的空间偏移

Spatial Offsets in Flare-CME Current Sheets

John C. Raymond, Silvio Giordano, Angela Ciaravella

摘要:

磁重联在几乎所有的太阳耀斑和日冕物质抛射(CME)模型中都起着不可或缺的作用。重连加热并加速等离子体,产生高能电子和离子,并改变磁拓扑结构,形成磁通量绳,使日冕物质抛射逃逸。在光学、紫外、极紫外和X射线观测中,耀斑环和日冕物质抛射核心之间出现的结构被确定为电流片,并根据重连过程的性质和事件的能量学进行解释。这些研究中的许多都使用了[Fe XVIII]和Si XII线中高温发射特征的紫外光谱观测。在本文中,我们讨论了几个令人惊讶的情况下,[Fe XVIII]和Si XII发射峰在空间上相互偏移。我们讨论的解释的基础上不对称的重联,薄重联区域内更广泛的流光状结构,和投影效果。有些事件似乎很容易被解释为沿着视线延伸的薄片的投影,但根据不对称重联的物理解释也是合理的。其他事件有利于解释为薄电流片嵌入在一个流光状的结构。

英文摘要:

Magnetic reconnection plays an integral part in nearly all models of solar flares and coronal mass ejections (CMEs). The reconnection heats and accelerates the plasma, produces energetic electrons and ions, and changes the magnetic topology to form magnetic flux ropes and allow CMEs to escape. Structures that appear between flare loops and CME cores in optical, UV, EUV and X-ray observations have been identified as current sheets and interpreted in terms of the nature of the reconnection process and the energetics of the events. Many of these studies have used UV spectral observations of high temperature emission features in the [Fe XVIII] and Si XII lines. In this paper we discuss several surprising cases in which the [Fe XVIII] and Si XII emission peaks are spatially offset from each other. We discuss interpretations based on asymmetric reconnection, on a thin reconnection region within a broader streamer-like structure, and on projection effects. Some events seem to be easily interpreted as projection of a sheet that is extended along the line of sight that is viewed an angle, but a physical interpretation in terms of asymmetric reconnection is also plausible. Other events favor an interpretation as a thin current sheet embedded in a streamer-like structure.

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