Observations of Reconnection Flows in a Flare on the Solar Disk
Observations of Reconnection Flows in a Flare on the Solar Disk
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DOI：
10.3847/2041-8213/aa8904
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发表时间：
2017-08
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影响因子：
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通讯作者：
Juntao Wang;P. Simões;N. Jeffrey;L. Fletcher;P. Wright;I. Hannah
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作者：
Juntao Wang;P. Simões;N. Jeffrey;L. Fletcher;P. Wright;I. Hannah
磁重联是太阳爆发事件理论中被广泛接受的一部分，尽管证据仍然是间接的。本质上的重联图片的太阳爆发事件，特别是在标准模型的双带耀斑（CSHKP模型），是一个平流的磁化等离子体进入重联区，膨胀的磁场以上的重联区作为一个通量绳爆发，收缩的加热后重联环路，和下行的冷却等离子体沿着这些环路。我们报告了一组独特的太阳动力学天文台/大气成像组件成像和Hinode/EUV成像光谱仪光谱观测的磁盘耀斑SOL 2016 -03- 23 T03：54，其中所有四个流同时存在。这包括光谱证据等离子体上升流与大规模扩大封闭流入领域。重联流入是对称的，并与快速重联一致，和后重联环显示出明显的冷却和减速，因为他们收回。日冕重联流的观测仍然很罕见，大多数事件都是在太阳边缘观测到的，被复杂的前景所掩盖，使得它们与耀斑带、尖点场和低层大气中形成的弧的关系难以解释。盘的位置和有利的角度来看，这一事件已经消除了这些含糊之处，给出了一个清晰的图片的重连动力学。
Magnetic reconnection is a well-accepted part of the theory of solar eruptive events, though the evidence is still circumstantial. Intrinsic to the reconnection picture of a solar eruptive event, particularly in the standard model for two-ribbon flares (CSHKP model), are an advective flow of magnetized plasma into the reconnection region, expansion of field above the reconnection region as a flux rope erupts, retraction of heated post-reconnection loops, and downflows of cooling plasma along those loops. We report on a unique set of Solar Dynamics Observatory/Atmospheric Imaging Assembly imaging and Hinode/EUV Imaging Spectrometer spectroscopic observations of the disk flare SOL2016-03-23T03:54 in which all four flows are present simultaneously. This includes spectroscopic evidence for a plasma upflow in association with large-scale expanding closed inflow field. The reconnection inflows are symmetric, and consistent with fast reconnection, and the post-reconnection loops show a clear cooling and deceleration as they retract. Observations of coronal reconnection flows are still rare, and most events are observed at the solar limb, obscured by complex foregrounds, making their relationship to the flare ribbons, cusp field, and arcades formed in the lower atmosphere difficult to interpret. The disk location and favorable perspective of this event have removed these ambiguities giving a clear picture of the reconnection dynamics.