Study on the relationship between the residual 27 day quasiperiodicity and ionospheric Q disturbances
Study on the relationship between the residual 27 day quasiperiodicity and ionospheric Q disturbances
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剩余27天准周期性与电离层Q扰动关系研究
DOI：
10.1002/2016ja023195
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发表时间：
2017-02
影响因子：
2.8
通讯作者：
Wu Zhi Xu
中科院分区：
文献类型：
--
作者：
Chen Zhou;Wang Jing Song;Deng Xiaohua;Deng Yue;Huang Chun Ming;Li Hai Meng;Wu Zhi Xu
本文用三种方法研究了剩余27天准周期性（QP）与Q扰动之间的关系。用月中位数法（MMM）和常用的27天运行中位数中心法（RMC）识别的两个Q扰动在同一时期表现出显著的日变化，而用光谱白化法（SWM）识别的Q扰动在同一时期表现得很平稳。进一步分析表明，随日变化的Q扰动事件往往出现在QP的极值位置（EVP），这是与QP相关的Q扰动事件。RMC和MMM的比例分别为81.8%和95.6%，而SWM的比例为0%。功率谱分析表明，QP是RfoF2‐RMC和RfoF2‐MMM在频域的重要频率分量（RfoF2表示foF2的相对偏差）。然而，在RfoF2‐SWM中没有明显的周期成分。最后，为了进一步验证QP是否会导致常见的Q干扰事件，我们使用带通滤波来提取不同站点的QP。在90%的站点中，MMM和RMC获得的QP的EVP中Q干扰的发生率高于SWM。此外，基于RMC的平均发生率（37.5%）也显著高于EVP的发生率（23.2%）。这些发现表明，传统方法的局限性导致其结果中存在显著的QP，并且这种残余QP可能引起人工Q干扰。
In this paper, the relationship between the residual 27 day quasiperiodicity (QP) and Q disturbances is studied using three methods. Two Q disturbances identified by the monthly median method (MMM) and the commonly used 27 day running median centered method (RMC) show significant diurnal variation but are seen quiet in the same period when the spectral whitening method (SWM) is used. Further analysis indicates that diurnally varying Q disturbance events tend to appear in the extreme value position (EVP) of QP, which are the Q disturbance events related to QP. And their percentages are 81.8% for RMC and 95.6% for MMM but 0% for SWM. By studying the power spectrum, it suggests that the QP is the significant frequency component in the frequency domain of RfoF2‐RMC and RfoF2‐MMM (RfoF2 denotes to the relative deviation of foF2). However, there are no obvious periodic components in RfoF2‐SWM. Finally, to further verify whether the QP can contribute to common Q disturbance events, band‐pass filtering is used to extract the QP at different stations. The occurrence percentages of Q disturbances in the EVP of QP thus obtained with MMM and RMC are higher than with SWM for 90% of the stations. In addition, the average occurrence percentage based on RMC (37.5%) is also significantly higher than the percentage of EVP (23.2%). These findings suggest that the limitations of traditional methods lead to a significant QP in their results and that this residual QP may cause artificial Q disturbances.
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DOI：
10.1016/s1364-6826(01)00036-0
发表时间：
2001-10
影响因子：
1.9
作者：
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通讯作者：
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