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Modelling of geomagnetically induced currents during geomagnetic storms using geoelectric fields and auroral electrojet indices

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Abstract

The effects of space weather on ground based technology mostly occur due to the varying geomagnetic field during geomagnetic storms, producing geomagnetically induced current (GIC). Space weather storms involve intense and rapidly varying electric currents in the ionosphere, which create geoelectric and geomagnetic fields at the Earth’s surface. In this study we have investigated some intense geomagnetic storms: September 18th, 2000; March 31th, 2001; October 21st, 2001; November 6th and 24th, 2001; October 29th and 31st, 2003 and November 9th, 2004. The electric field for each day has been computed using ground conductivity and geomagnetic recordings. The conductivity models are determined by least square fit between the observed and predicted GIC values. Our results show that GIC are strongly correlated with the geoelectric field, and also with eastward and westward auroral electrojet indices and time derivatives of the horizontal geomagnetic field. Root mean square error statistical test has been employed to evaluate the accuracy of the models used.

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Acknowledgments

The authors acknowledge the World Data Centre (WDC) for geomagnetism, and Space Physics Interactive Data Resources (SPIDR) for AL and AU indices data. We would also like to thank Dr Ari Viljanen, from the Finnish Meteorological Institute, Space Research Unit, Helsinki, Finland, for the efficient and cheerful provision of geomagnetic field and geomagnetically Induced Current data.

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Authors and Affiliations

  1. Department of Physics, Tai Solarin University of Education, Ijagun, P.M.B 2118, Ijebu-Ode, Nigeria

    E. O. Falayi

  2. Space Science Centre, University of Sussex, Brighton, East Sussex, BN1 9QJ, UK

    E. O. Falayi & N. Beloff

Authors
  1. E. O. Falayi
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  2. N. Beloff
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Correspondence to E. O. Falayi.

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Falayi, E.O., Beloff, N. Modelling of geomagnetically induced currents during geomagnetic storms using geoelectric fields and auroral electrojet indices. Indian J Phys 86, 423–429 (2012). https://doi.org/10.1007/s12648-012-0108-0

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  • DOI: https://doi.org/10.1007/s12648-012-0108-0

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