J. Space Weather Space Clim.
Volume 11, 2021
|Number of page(s)||10|
|Published online||13 August 2021|
Statistics of large impulsive magnetic events in the auroral zone
Department of Physics and Astronomy, University of Calgary, Calgary T2N 1N4, AB, Canada
2 TransÉnergie-Équipement, Hydro-Québec, Montréal H5B 1H7, QC, Canada
3 Athabasca University Observatories, Athabasca T9S 3A3, AB, Canada
* Corresponding author: firstname.lastname@example.org
Accepted: 11 July 2021
Impulsive geomagnetic variations, latitudinally localized to the auroral zone, have been observed from 2015 to 2020. These impulsive events have been observed mostly in the pre-midnight sector as upward vertical perturbations. Diurnal variations in geomagnetically-triggered harmonic distortion events observed in Hydro-Québec’s Système de Mesure de Décalage Angulaire (SMDA) synchrophasor measurement system found to have a peak in the number of events around midnight. This was similar to diurnal rates of negative Bz geomagnetic impulsive events observed at nearby auroral zone magnetometers. Superposed epoch analysis demonstrates the impulses are regularly associated with increases in harmonic distortion observed at a nearby substation transformer. These large impulsive vertical geomagnetic perturbations appear to be local vortical ionospheric disturbances.
Key words: impulsive geomagnetic events / geomagnetically induced currents / auroral zone ionosphere
© K. Reiter et al., Published by EDP Sciences 2021
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