Oral Presentation
The Geo-Magneto-Electric Connection
Presenter: Martin Connors (Athabasca University)
Large Impulse Magnetic Events (LIME) have been discovered by the AUTUMNX magnetometer network in conjunction with instruments of the Hydro-Québec electric transmission grid. The one-to-one correspondence of geomagnetically induced current (GIC) and magnetic field vertical component derivatives suggests that induced geoelectric fields drove the GIC. By extension, in the September 7-9 2017 magnetic storm, when electric field measurements were available near the Québec border from the US-based USArray magnetotelluric network, both the harmonic distortion GIC proxy and the electric fields are impulsive, although it appears to be difficult to make a one-on-one identification. We will discuss how directed space weather studies using magnetotelluric instrumentation may help make the connection between auroral current drivers and GIC effects in the power grid.
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