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Using the ionospheric response to the solar eclipse on 20th March 2015 to detect spatial structure in the solar corona

机译:使用2015年3月20日的电离层对日食的响应来检测日冕中的空间结构

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摘要

Long-term variability has previously been observed in the relative magnitude of annual and semi-annual variations in the critical frequency (related to the peak electron concentration) of the ionospheric F2 layer (foF2). In this paper we investigate the global patterns in such variability by calculating the time varying power ratio of semi-annual to annual components seen in ionospheric foF2 data sequences from 77 ionospheric monitoring stations around the world. The temporal variation in power ratios observed at each station was then correlated with the same parameter calculated from similar epochs for the Slough/Chilton data set (for which there exists the longest continuous sequence of ionospheric data). This technique reveals strong regional variation in the data, which bears a striking similarity to the regional variation observed in long-term changes to the height of the ionospheric F2 layer. We argue that since both the height and peak density of the ionospheric F2 region are influenced by changes to thermospheric circulation and composition, the observed long-term and regional variability can be explained by such changes. In the absence of long-term measurements of thermospheric composition, detailed modelling work is required to investigate these processes.
机译:先前已经观察到电离层F2层(foF2)的临界频率(与峰值电子浓度有关)的年度和半年度变化的相对大小具有长期变化性。在本文中,我们通过计算来自全球77个电离层监测站的电离层foF2数据序列中看到的半年度分量与年度分量的时变功率比,来研究这种可变性的全局模式。然后,将在每个站观测到的功率比的时间变化与从类似时间段(对于Slough / Chilton数据集(存在着最长的电离层数据连续序列))计算出的相同参数相关联。这项技术揭示了数据中强烈的区域变化,这与在电离层F2层高度的长期变化中观察到的区域变化具有惊人的相似性。我们认为,由于电离层F2区域的高度和峰值密度都受热圈环流和成分变化的影响,因此观测到的长期和区域变化可以用这种变化来解释。在没有长期测量热层成分的情况下,需要详细的建模工作来研究这些过程。

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