HR: 1330h
AN: SM32B-1161    [PDF]
TI: Auroral zone GIC proxy dependence on solar wind speed
AU: * Jackel, B J
EM: bjackel@phys.ucalgary.ca
AF: University of Calgary, Institute for Space Research, Physics and Astronomy Dept. University of Calgary 2500 University Drive, Calgary, AB T2N 1N4 Canada
AU: Donovan, E F
EM: eric@phys.ucalgary.ca
AF: University of Calgary, Institute for Space Research, Physics and Astronomy Dept. University of Calgary 2500 University Drive, Calgary, AB T2N 1N4 Canada
AU: Baker, G J
AF: University of Calgary, Institute for Space Research, Physics and Astronomy Dept. University of Calgary 2500 University Drive, Calgary, AB T2N 1N4 Canada
AU: Wallis, D D
AF: Magnametrics, 2340 Briar Hill Drive, Ottawa, ON K1H 7A9 Canada
AU: Boteler, D H
AF: Geological Survey of Canada, Geomagnetic Laboratory 7 Observatory Crescent, Ottawa, ON K1A 0Y3 Canada
AB: Dynamic changes in the geomagnetic field provide useful information about the coupled earth-sun system. They also produce ground induced currents (GIC) that can have a profound impact on artificial systems such as pipelines, communications networks, and power transmission grids. Recent work has established that the time derivative of the horizontal magnetic field (dH/dt) is a good proxy for GIC. For this study we analyzed 15 years of data from the CANOPUS magnetometer array, which has 13 sites located primarily in the auroral zone. Most results (ie. weak 11-year and 27-day dependencies, strong latitudinal and local time dependence) are similar to those obtained in other studies. However, we also found a strong quasi- periodic variation in dH/dt with time scales of 7-14 days. This led to the discovery of a strong correlation between dH/dt and solar wind speed. We will present these results, and show how they can be used to predict GIC risks.
DE: 1515 Geomagnetic induction
DE: 1530 Rapid time variations
DE: 2447 Modeling and forecasting
DE: 2736 Magnetosphere/ionosphere interactions
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting