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Auroral Omega Bands are a Significant Cause of Large Geomagnetically Induced Currents

Apatenkov, S. V. ; Pilipenko, V. A. ; Gordeev, E. I. ; Viljanen, A. ; Juusola, L. ; Belakhovsky, V. B. ; Sakharov, Ya. A. ; Selivanov, V. N.

Geophysical research letters, 2020-03, Vol.47 (6), p.n/a [Periódico revisado por pares]

Washington: Blackwell Publishing Ltd

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Título:
Auroral Omega Bands are a Significant Cause of Large Geomagnetically Induced Currents
Autor: Apatenkov, S. V. ; Pilipenko, V. A. ; Gordeev, E. I. ; Viljanen, A. ; Juusola, L. ; Belakhovsky, V. B. ; Sakharov, Ya. A. ; Selivanov, V. N.
Assuntos: Defense programs ; DMSP satellites ; Electric currents ; Electrodynamics ; Extreme values ; Geomagnetic effects ; geomagnetically induces currents ; Geomagnetism ; ionosphere ; Magnetic effects ; Magnetic storms ; Magnetic variations ; Magnetometers ; magnetosphere ; Meteorological satellite program ; Meteorological satellites ; omega bands ; Sequencing ; Southern Hemisphere ; Spacecraft ; Storms ; Temporal variations
É parte de: Geophysical research letters, 2020-03, Vol.47 (6), p.n/a
Descrição: The strongest event of geomagnetically induced currents (GIC) detected by the North‐West Russian GIC network occurred during the main phase of the magnetic storm on 28 and 29 June 2013. Extremely high value, 120 A, was recorded in the 330 kV transformers on Kola Peninsula in the 04–07 magnetic local time (MLT) sector. The Defense Meteorological Satellite Program (DMSP) spacecraft took a sequence of ultraviolet (UV) auroral images in the southern hemisphere and observed multiple omega bands. The ionospheric equivalent electric currents based on the International Monitor for Auroral Geomagnetic Effects (IMAGE) magnetometer network reveal a sequence of current vortex pairs moving eastward with the speed of 0.5–2.5 km/s that fits to the electrodynamics scheme of omega bands. Although the temporal variations of the associated current system are slow, the omega bands can be responsible for strong magnetic variations and GIC due to fast propagations of currents in the azimuthal direction. Key Points Auroral omega bands related to large GIC Eastward drifting ionospheric current structures produce large GIC Ionospheric current motion is as important as its intensity variation
Editor: Washington: Blackwell Publishing Ltd
Idioma: Inglês

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Auroral Omega Bands are a Significant Cause of Large Geomagnetically Induced Currents

Apatenkov, S. V. ; Pilipenko, V. A. ; Gordeev, E. I. ; Viljanen, A. ; Juusola, L. ; Belakhovsky, V. B. ; Sakharov, Ya. A. ; Selivanov, V. N.

Washington: Blackwell Publishing Ltd

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