Statistical Relations Between Geomagnetic Field Data and Harmonic Distortion Driven by Geomagnetically Induced Currents in Québec, Canada
Abstract
Geomagnetic field data from magnetometers in the AUTUMNX network are compared to direct measurements of harmonic distortion, driven by quasi-DC potential differences associated with Geomagnetically Induced Currents (GIC) in the Hydro-Québec network. Differing spatial distributions, with a limited number of magnetometers, and transformers where harmonics are measured as well as varying earth conductivity limits the ability to precisely model harmonic generation in the network. Statistical relations between harmonic distortion events as flagged by the Hydro-Québec Système de Mesure de Décalage Angulaire (SMDA), solar wind parameters in the OMNI dataset, and AUTUMNX geomagnetic field measurements in the three year period between October 2014 and October 2017 are explored. Canonical Correlation Analysis (CCA) of the geomagnetic and SMDA datasets indicate correlations between common modes of the two datasets. Additionally, comparisons are made, using local geomagnetic field measurements with global geomagnetic indices such as Kp and DST as measures for harmonic distortion. Principal Component Analysis (PCA) of the harmonic distortion datasets indicates that dominant harmonics excited are not necessarily correlated with excitations of other harmonics, or with principal components of all of the harmonics. The dominant harmonics of the substation in periods of high harmonic distortion were also found to be variable.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMIN33D0885R
- Keywords:
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- 4313 Extreme events;
- NATURAL HAZARDSDE: 7904 Geomagnetically induced currents;
- SPACE WEATHERDE: 7934 Impacts on technological systems;
- SPACE WEATHERDE: 7999 General or miscellaneous;
- SPACE WEATHER