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TitleThe use of linear superposition in modelling geomagnetically induced currents
AuthorBoteler, D H
SourceProceedings IEEE Power & Energy Society General Meeting; 2013 p. 1-5,
Alt SeriesEarth Sciences Sector, Contribution Series 20140026
MeetingIEEE Power & Energy Society General Meeting; Vancouver; CA; July 21-15, 2013
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; geomagnetic fields; geomagnetism; geomagnetic variations; currents
Illustrationsschematic diagrams; rose diagrams; tables
ProgramNorthern Canada Geohazards Project, Public Safety Geoscience
AbstractThis paper examines how the principle of superposition can be applied to modelling geomagnetically induced currents (GIC) produced by components of the electric field. Localised electric fields can be modelled individually to determine their effect on GIC flows. Also results obtained separately for northward and eastward electric fields can be combined to give the GIC produced by an electric field of arbitrary magnetitude and direction. Formulas are presented for the maximum GIC and the direction of the electric field giving the maximum value. Electric field time series can also be combined with the component model results to give the time series of GIC values. This can be used for geomagnetic hazard assessment by providing an efficient method to determine the GIC produced by historically large magnetic disturbances.
Summary(Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, satellites, radio communications and GNSS positioning to help Canadian industry understand and mitigate the effects of space weather. This paper describes how the superposition of results can be used in modelling the geomagnetically induced currents that are a hazard to power systems.