Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32b1161j&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM32B-1161
Other
1515 Geomagnetic Induction, 1530 Rapid Time Variations, 2447 Modeling And Forecasting, 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
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.
Baker John G.
Boteler David H.
Donovan Eric F.
Jackel Brian J.
Wallis Don D.
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