Abstract
Spectral content of Pc5--6/Pi3 geomagnetic pulsations and their efficiency in generation of geomagnetically induced currents
Highlights
GICs in electric power lines (EPLs) are generated during geomagnetic disturbances in a contour formed by the EPL, grounding, and the Earth’s crust
In the present study we examine a possible influence of the ULF spectral content on the efficiency of GIC generation by Pc5–6/Pi3 geomagnetic pulsations using data of several years of GIC and geomagnetic observations in the Russian North-West and Fennoscandia
This means that the Pc5–6/Pi3 pulsations with typical amplitudes about few tens nT cause of potentially risky GICs variations with amplitudes about few tens A, while rare extreme GICs with amplitudes about of higher than 100 A originate from pulsations with extremely high amplitudes at the main or recovery phase of a magnetic storm [Apatenkov et al, 2020; Wik et al, 2008]
Summary
GICs in electric power lines (EPLs) are generated during geomagnetic disturbances in a contour formed by the EPL, grounding, and the Earth’s crust. ULF geomagnetic pulsations in the Pc5–6/Pi3 band (periods 3–15 min) till recent time have been an underestimated factor of GIC-associated hazard to technological systems. Their long duration (several hours on average), large amplitudes (sometimes comparable with weak substorm), and dB/dt absolute values, which showed their efficiency in GIC estimates [Viljanen, 1997], make to consider ULF activity as a serious threat to power lines [Kataoka and Pulkkinen, 2008]. As disturbances caused by a magnetic storm are global, GIC intensity is controlled by geomagnetic field time variations, as well as by spatial distribution of the conductivity of the Earth’s crust and the parameters of electric circuit In the present study we examine a possible influence of the ULF spectral content on the efficiency of GIC generation by Pc5–6/Pi3 geomagnetic pulsations using data of several years of GIC and geomagnetic observations in the Russian North-West and Fennoscandia
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
