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Study on the relationship between the residual 27 day quasiperiodicity and ionospheric Q disturbances
Author(s) -
Chen Zhou,
Wang JingSong,
Deng Xiaohua,
Deng Yue,
Huang ChunMing,
Li Hai Meng,
Wu Zhi Xu
Publication year - 2017
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja023195
Subject(s) - quasiperiodicity , residual , mathematics , quiet , disturbance (geology) , statistics , position (finance) , geodesy , demography , geography , physics , mathematical analysis , algorithm , biology , economics , sociology , paleontology , quasiperiodic function , finance , quantum mechanics
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 R f o F 2 ‐RMC and R f o F 2 ‐MMM (R f o F 2 denotes to the relative deviation of f o F 2 ). However, there are no obvious periodic components in R f o F 2 ‐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.