April 2000 Geomagnetic Storm: Ionospheric Drivers of Large Geomagnetically Induced Currents

Details April 2000 Geomagnetic Storm: Ionospheric Drivers of Large Geomagnetically Induced Currents April 2000 Geomagnetic Storm: Ionospheric Drivers of Large Geomagnetically Induced Currents

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0495p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0495

Mathematics

Logic

1515 Geomagnetic Induction, 2435 Ionospheric Disturbances, 2788 Storms And Substorms

Scientific paper

Geomagnetically induced currents (GIC) flowing in technological systems on the ground are a manifestation of space weather. Due to the proximity of very dynamic ionospheric current systems, GIC are of special interest at high latitudes where they are known to cause harm e.g. for normal operation of power transmission systems and buried pipelines. Despite numerous studies on GIC, there still exists no well established picture of the detailed structure of the ionospheric currents driving large GIC. Although some rough estimations of large-scale electrojet intensities and structures during GIC events have been carried out, no rigorous study of the ionospheric source currents has been made so far. In this study, a single intense geomagnetic storm event on April 6-7, 2000 is investigated. During the event, large GIC were measured in technological systems both in Finland and in Great Britain, providing a basis for a detailed GIC study over quite a large spatial scale. By using these GIC data and geomagnetic data from north European magnetometer networks, the ionospheric drivers of the large GIC during the event were identified and analyzed.

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