Abstract
The relationships between variations of geomagnetic field and geomagnetically induced current (GIC) are studied using data from the station for registration of GIC in the electric transmission line and the IMAGE magnetic observatory. A highest correlation of GIC intensity (R > 0.7) is found with the field variability |dB/dt|, whereas the correlations of GIC with the time derivatives of X and Y components are about the same. The diurnal variations of hourly values of geomagnetic field variability and GIC intensity have a wide night maximum associated with the substorm activity, and a wide morning maximum presumably caused by geomagnetic pulsations of the Pc5-Pi3 type. A regression linear model is constructed to estimate GIC magnitude from the local time derivative of geomagnetic field. The statistical distributions of the probability density of |dB/dt| and GIC correspond to the log-normal law. On the basis of the constructed distributions the probabilities of extreme values of GIC and |dB/dt| are estimated.
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Acknowledgements
This study was supported by the grant 16-17-00121 from the Russian Science Foundation. The authors are grateful to the research teams operating the IMAGE magnetometer network. The maintenance of the GIC recording system by the Polar Geophysical Institute and Center of Physical and Technical Problems of the Northern Energetics is supported by the grant 17-48-510199 from the Russian Foundation for Basic Research and the Murmansk region government.
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Vorobev, A.V., Pilipenko, V.A., Sakharov, Y.A., Selivanov, V.N. (2020). Statistical Properties of the Geomagnetic Field Variations and Geomagnetically Induced Currents. In: Yanovskaya, T., Kosterov, A., Bobrov, N., Divin, A., Saraev, A., Zolotova, N. (eds) Problems of Geocosmos–2018. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-21788-4_5
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