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SPACE WEATHER,
VOL. 6,
S11004,
8 PP., 2008
doi:10.1029/2008SW000408
Improved modeling of geomagnetically induced currents in the South African power network
Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa
Hermanus Magnetic Observatory, Hermanus, South Africa
Goddard Space Flight Center, NASA, Greenbelt, Maryland, USA
Goddard Earth Sciences and Technology Center, University of Maryland, Baltimore, Maryland, USA
Department of Physics and Electronics, Rhodes University, Grahamstown, South Africa
Hermanus Magnetic Observatory, Hermanus, South Africa
Hermanus Magnetic Observatory, Hermanus, South Africa
Geomagnetically induced currents (GICs), resulting from adverse space weather, have been demonstrated to cause damage to power transformers in the midlatitudes. There is growing concern over possible GIC effects in the Southern African network because of its long power lines. Previous efforts to model the electric field associated with GICs in South Africa have used a uniform ground conductivity model. In an effort to improve the modeling of GICs, GIC data together with the Hermanus Magnetic Observatory geomagnetic field data were used in order to obtain a multilayered ground conductivity structure. The method requires a definition of the network coefficients, which are then used in subsequent calculations. This study shows that GIC computed using the new network coefficients and the multilayered ground conductivity model improves the accuracy of GIC modeling. GIC statistics are then derived on the basis of the recordings of the geomagnetic field from 1996 to 2006 at Hermanus, the new network coefficients, and ground conductivity model. The geoelectric field was modeled using the plane wave method.
Received 30 April 2008; accepted 21 July 2008; published 20 November 2008.
Citation: (2008), Improved modeling of geomagnetically induced currents in the South African power network, Space Weather, 6, S11004, doi:10.1029/2008SW000408.
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