TY - JOUR
T1 - Statistics of large impulsive magnetic events in the auroral zone
AU - Reiter, Kyle
AU - Guillon, Sébastien
AU - Connors, Martin
AU - Jackel, Brian
N1 - Funding Information:
Acknowledgements. For the SML and SMU indices, we gratefully acknowledge the SuperMAG collaborators (https:// supermag.jhuapl.edu/info/?page=acknowledgement). SuperMAG data sets are available from their repository (https://supermag. jhuapl.edu/). AUTUMNX is supported by CSA funding (http:// autumn.athabascau.ca), with open data access to magnetic data used in this study. We thank Ian Schofield for his role in the installation and operation of the AUTUMNX array. Harmonic distortion data was provided to us by Hydro-Québec. Archiving historical GIC and HD data is a time-consuming and costly endeavor for which we would like to thank Hydro-Québec, and it is a practice we would encourage other utilities to consider emulating. The editor thanks two anonymous reviewers for their assistance in evaluating this paper.
Publisher Copyright:
© K. Reiter et al., Published by EDP Sciences 2021.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Auroral zone ionosphere
KW - Geomagnetically induced currents
KW - Impulsive geomagnetic events
UR - http://www.scopus.com/inward/record.url?scp=85113161196&partnerID=8YFLogxK
U2 - 10.1051/swsc/2021029
DO - 10.1051/swsc/2021029
M3 - Journal Article
AN - SCOPUS:85113161196
VL - 11
JO - Journal of Space Weather and Space Climate
JF - Journal of Space Weather and Space Climate
M1 - 44
ER -