Journal
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume 62, Issue 14, Pages 1311-1315Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1364-6826(00)00071-7
Keywords
geo-electric field; electrojet
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Forecasting the geomagnetic effects to technological systems on the ground requires rapid calculations of the electric and magnetic fields produced by the auroral electrojet. The electrojet is often modelled as a line current at a height of 100 km, but in reality it has a finite width and is typically spread over 5 degrees or 6 degrees of latitude. We show that the width of the electrojet can easily be included in electric and magnetic field calculations by assuming that the ionospheric current density has a Cauchy distribution with a half-width a, j(x)=(I/pi )a/(chi (2) + a(2)), at a height h. It is shown that the electric and magnetic fields produced at the surface of a layered earth by such a current are equivalent to the fields produced by a line current I at a height h + a. This equivalence, combined with the complex image method, leads to simple formulas that provide a method for fast calculation of the electric and magnetic fields that can affect ground-based systems. Crown Copyright (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
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