Speaker
Description
Events with extreme magnitudes of geomagnetically induced currents (GICs) in the power transmission lines on the Kola Peninsula for the quasi-solar cycle 2012-2022 are analyzed. GIC recordings from Vykhodnoy (VKH) and Kondopoga (KND) sub-stations together with data from near-by magnetometers have been examined. Extreme bursts of GIС are mainly observed in the pre-midnight and post-midnight magnetic local time sectors. From the total 92 extreme events (GIC >20 A) at auroral sub-station VKH 51.1% were caused by CME magnetic storms, 36.9% occurred during CIR magnetic storms, 3.3% are caused by SC/SI and 8.7% occurred during substorms without magnetic storm. From 31 extreme events (GIC >5 A) at subauroral sub-station KND 80.6% were observed during CME storms, 12.9% occurred during CIR storms, and 6.5% took place without a magnetic storm. Therefore, for the prediction of the space weather impact on power lines, both CME and CIR storms should be considered. Maximal GIC magnitude grows on average with an increase of geomagnetic field variability dB/dt, but for many events the actual GIC is less than the maximal possible value due to a localized nature of magnetic field disturbance. There is no clear linear dependence of the GIC amplitude on the interplanetary parameters and geomagnetic indices, which indicates the difficulty of predicting GICs in a particular technological system.
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