Statistical relationships between variations of the geomagnetic field, auroral electrojet, and geomagnetically induced currents
Autor: | Yaroslav Sakharov, Vyacheslav Pilipenko, A. V. Vorobev, Vasiliy Selivanov |
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Rok vydání: | 2019 |
Předmět: |
Atmospheric Science
geomagnetically induced currents 010504 meteorology & atmospheric sciences Electrojet lcsh:Astrophysics Geophysics 010502 geochemistry & geophysics 01 natural sciences Geomagnetically induced current Earth's magnetic field Space and Planetary Science geomagnetic field 0103 physical sciences lcsh:QB460-466 Physics::Space Physics geomagnetic variations auroral electrojet 010303 astronomy & astrophysics Geology Computer Science::Information Theory 0105 earth and related environmental sciences |
Zdroj: | Solar-Terrestrial Physics, Vol 5, Iss 1, Pp 35-42 (2019) |
ISSN: | 2500-0535 |
Popis: | Using observations from the IMAGE magnetic observatories and the station for recording geomagnetically induced currents (GIC) in the electric transmission line in 2015, we examine relationships between geomagnetic field and GIC variations. The GIC intensity is highly correlated (R>0.7) with the field variability |dB/dt| and closely correlated with variations in the time derivatives of X and Y components. Daily variations in the mean geomagnetic field variability |dB/dt| and GIC intensity have a wide night maximum, associated with the electrojet, and a wide morning maximum, presumably caused by intense Pc5–Pi3 geomagnetic pulsations. We have constructed a regression linear model to estimate GIC from the time derivative of the geomagnetic field and AE index. Statistical distributions of the probability density of the AE index, geomagnetic field derivative, and GIC correspond to the log-normal law. The constructed distributions are used to evaluate the probabilities of extreme values of GIC and |dB/dt|. |
Databáze: | OpenAIRE |
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