Global variation in the long-term seasonal changes observed in ionospheric F-region data
Global variation in the long-term seasonal changes observed in ionospheric F-region data
复制标题
电离层 F 区数据观测到的长期季节变化的全球变化
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Stamper
中科院分区：
文献类型：
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作者：
C. Scott;R. Stamper
抽象的。长期的变化以前已经观察到的相对大小的年度和半年的变化在临界频率（与峰值电子浓度）的电离层F2层（foF 2）。在本文中，我们调查的全球模式，在这种变化，通过计算的时变功率比的半年一年的组件中看到的电离层foF 2数据序列从世界各地的77个电离层监测站。然后，将每个台站观测到的功率比随时间的变化与从斯劳/奇尔顿数据集（存在最长的电离层数据连续序列）的类似历元计算出的相同参数相关联。该技术揭示了数据中强烈的区域变化，这与电离层F2层高度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的热层环流和组成的变化的影响，所观察到的长期和区域的变化可以解释这样的变化。在没有长期测量热层成分的情况下，需要进行详细的建模工作来研究这些过程。
Abstract. 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.