Can coronal hole spicules reach coronal temperatures
Can coronal hole spicules reach coronal temperatures
复制标题
冠状孔针能达到日冕温度吗
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
J. G. Doyle
中科院分区：
文献类型：
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作者：
M. Madjarska;K. Vanninathan;J. G. Doyle
目标。本研究的目的是提供观测证据的冕洞针状体是否达到日冕温度。方法.我们结合了联合收割机与SUMER/SoHO和EIS/SOT/XRT/Hinode获得的多仪器联合观测。结果分析的三个大骨针被发现是由许多薄骨针上升，旋转，并同时下降，形成一个类似的功能。它们的旋转类似于一根大通量绳的解旋。它们显示了速度在50到250 km s-1之间的城市。我们清楚地关联的红色和蓝移的过渡区线不仅与旋转，而且与上升和下降的等离子体的排放。我们的主要结果是，这些针状体虽然非常大和动态的，是不存在的光谱线形成的温度高于300 000 K。结论.在本文中，我们提出了三个Ca II H大针状体，是由许多动态薄针状体，但出现在低分辨率EUV图像的macrosepicules的分析。我们没有发现与之对应的冠状和较小的针状体。我们相信，将起源非常不同的现象识别为大针状体是由于对过渡区发射的解释，尤其是Heii发射，其中既存在色球大针状体，也存在日冕X射线喷流。我们认为最近在日冕AIA/SDO 171 A和211 A通道中观察到的针状体可能来自于那里过渡区发射的存在。
Aims. The present study aims to provide observational evidence of whether coronal hole spicules reach coronal temperatures. Methods. We combine multi-instrument co-observations obtained with the SUMER/SoHO and with the EIS/SOT/XRT/Hinode. Results. The analysed three large spicules were found to be comprised of numerous thin spicules that rise, rotate, and descend simultaneously forming a bush-like feature. Their rotation resembles the untwisting of a large flux rope. They show velo cities ranging from 50 to 250 km s −1 . We clearly associated the red- and blue-shifted emissions in transition region lines not only with rotating but also with rising and descending plasmas. Our main result is that these spicules although very large and dynamic, are not present in the spectral lines formed at temperatures above 300 000 K. Conclusions. In this paper we present the analysis of three Ca ii H large spicules that are composed of numerous dynamic thin spicules but appear as macrospicules in lower resolution EUV images. We found no coronal counterpart of these and smaller spicules. We believe that the identification of phenomena that have ver y different origins as macrospicules is due to the interpretation of the transition region emission, and especially the Heii emission, wherein both chromospheric large spicules and coronal X-ray jets are present. We suggest that the recent observation of spicules in the coronal AIA/SDO 171 A and 211 A channels probably comes from the existence of transition region emission there.