Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62.1311b&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 14, p. 1311-1315.
Physics
5
Scientific paper
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 100km, but in reality it has a finite width and is typically spread over /5° or /6° 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/π)a/(x2+a2), 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.
Boteler David H.
Pirjola Risto
Trichtchenko Larisa
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