极地喷流作为极地羽流形成前兆的证据
Evidence for polar jets as precursors of polar plume formation
摘要：
Hinode/XRT望远镜和STEREO/SECCHI/EUVI的观测被用来研究极地日冕喷流和羽流。研究的重点是这两种结构的时间演变和它们之间的关系。数据样本，跨越2007年4月7日至8日，显示，超过90%的28个观测到的喷流事件与极地羽流。极紫外图像（STEREO/SECCHI）显示，从大约70%的极地X射线（Hinode/XRT）和极紫外射流的位置升起的羽烟薄雾，在观察到射流后几分钟到几小时出现羽烟薄雾。其余的喷流发生在以前存在羽流物质的地区，导致喷流事件后羽流物质的亮度增强。在先前存在的长寿命羽流底部的不同位置，可以看到短暂的、类似喷流的事件和短暂的小亮点（一次一个）。X射线图像还显示了准直薄射流迅速演变成明显更宽的羽状结构的实例（至少两个事件），随后在EUV中延迟出现羽雾。这些观测提供了证据，证明X射线喷流是极地羽流的前兆，在某些情况下会导致羽流的增亮。可能的机制来解释所观察到的射流和羽流的关系进行了讨论。
英文摘要：
Observations from the Hinode/XRT telescope and STEREO/SECCHI/EUVI are utilized to study polar coronal jets and plumes. The study focuses on the temporal evolution of both structures and their relationship. The data sample, spanning April 7-8 2007, shows that over 90% of the 28 observed jet events are associated with polar plumes. EUV images (STEREO/SECCHI) show plume haze rising from the location of approximately 70% of the polar X-ray (Hinode/XRT) and EUV jets, with the plume haze appearing minutes to hours after the jet was observed. The remaining jets occurred in areas where plume material previously existed causing a brightness enhancement of the latter after the jet event. Short-lived, jet-like events and small transient bright points are seen (one at a time) at different locations within the base of pre-existing long-lived plumes. X-ray images also show instances (at least two events) of collimated-thin jets rapidly evolving into significantly wider plume-like structures that are followed by the delayed appearance of plume haze in the EUV. These observations provide evidence that X-ray jets are precursors of polar plumes, and in some cases cause brightenings of plumes. Possible mechanisms to explain the observed jet and plume relationship are discussed.
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