不显眼的太阳极冠X射线喷流作为显著的日冕/极紫外成像光谱仪（EIS）多普勒流出源
Inconspicuous Solar Polar Coronal X-ray Jets as the Source of Conspicuous Hinode/EUV Imaging Spectrometer (EIS) Doppler Outflows
摘要：
我们更详细地研究了五个事件，以前确定为在太阳极区的日出/极紫外成像光谱仪（EIS）多普勒数据的强瞬态日冕外流的来源。虽然在日出/软X射线望远镜（XRT）的软X射线（SXR）图像和太阳动力学天文台（SDO）/大气成像组件（AIA）的EUV图像中，这些事件相对紧凑或微弱且不明显，但我们发现所有这些事件都与微弱的日冕X射线喷流相一致。这方面的证据是，这些事件是由预测大小为5，000 - 14，000公里的微丝爆发造成的，爆发速度为19 - 46公里/秒，这在已证实的X射线极冕洞喷流的情况下观察到的数值范围内。在SXR图像和一些EUV图像中，所有五个事件都显示出底部增亮，以及喷射尖顶的微弱迹象（在五种可确定的情况下有四种）远离最亮的底部增亮;这些属性对于更明显的X射线喷射是共同的。对于一个相对低纬度的事件，微暗条从附近（<~几角秒）的位置附近的喷发时间相反极性的磁通量补丁的收敛，这再次是与许多观测到的日冕喷流一致。因此，虽然太过微弱而无法被先验地识别为喷流，但所有五个事件都与典型的日冕喷流相同。这表明，喷流可能比以前的研究中认识到的更多，并可能大大有助于太阳风外流，并在帕克太阳探测器（PSP）的数据中观察到的磁之字形人口。
英文摘要：
We examine in greater detail five events previously identified as being sources of strong transient coronal outflows in a solar polar region in Hinode/EUV Imaging Spectrometer (EIS) Doppler data. Although relatively compact or faint and inconspicuous in Hinode/Soft X-ray Telescope (XRT) soft-X-ray (SXR) images and in Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) EUV images, we find that all of these events are consistent with being faint coronal X-ray jets. The evidence for this is that the events result from eruption of minifilaments of projected sizes spanning 5000 -- 14,000 km and with erupting velocities spanning 19 -- 46 km/s, which are in the range of values observed in cases of confirmed X-ray polar coronal hole jets. In SXR images, and in some EUV images, all five events show base brightenings, and faint indications of a jet spire that (in four of five cases where determinable) moves away from the brightest base brightening; these properties are common to more obvious X-ray jets. For a comparatively low-latitude event, the minifilament erupts from near (<~few arcsec) a location of near-eruption-time opposite-polarity magnetic-flux-patch convergence, which again is consistent with many observed coronal jets. Thus, although too faint to be identified as jets a priori, otherwise all five events are identical to typical coronal jets. This suggests that jets may be more numerous than recognized in previous studies, and might contribute substantially to solar wind outflow, and to the population of magnetic switchbacks observed in Parker Solar Probe (PSP) data.
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