Abstract
To explore the global-scale coupling characteristics between ionospheric disturbances and geomagnetic storms, and research the near-Earth space environment, the time synchronization, correlation, and fitting relationship of geomagnetic field and ionosphere are analyzed in 78 geomagnetic storms from 2013 to 2017. Simultaneously, in order to improve the accuracy of ionospheric disturbance monitoring, a method for detecting ionospheric disturbances based on wavelet transform is proposed. Results show that the signal noise of global electron content is abnormally enhanced in 76% of the geomagnetic storm events, and the abnormal period coincides with the fluctuation period of the geomagnetic index. Two parameters, named Match and non-Match, are proposed to quantify the time synchronization between geomagnetic storms and ionospheric disturbances, it is found that a high synchronization exists between the two. The weighted polynomial function model, which used the ionospheric and geomagnetic parameters, is established. The fitting results show a significant functional relationship between the two, indicating that geomagnetic storm has a significant effect on ionospheric disturbance. The T-test results indicate a significant correlation between the fitted function and the measured data in 86% storm events.
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ACKNOWLEDGMENTS
The results presented in this paper rely on data collected at geomagnetic observatories, so we thank for International association of geomagnetism and upper atmosphere physics (IAGA) and International Real-time Magnetic Observatory Network (INTERMAGNET), which had provided high standards of a geomagnetic index and geomagnetic intensity observation data for this research. We would also like to thank the International GNSS Service (IGS) for providing Global Ionosphere Maps data.
Funding
This work is supported by the Research Fund of Chengdu University of Information Technology (no. KYTZ202114).
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Nisong Pei, Wu, Y., Su, R. et al. Global-Scale Coupling Characteristics between Geomagnetic Storms and Ionospheric Disturbances. Geomagn. Aeron. 61, 632–646 (2021). https://doi.org/10.1134/S0016793221040101
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DOI: https://doi.org/10.1134/S0016793221040101