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Fast Computation of the Geoelectric Field Using the Method of Elementary Current Systems and Planar Earth Models : Volume 22, Issue 1 (01/01/2004)

By Viljanen, A.

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Book Id: WPLBN0003985109
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Fast Computation of the Geoelectric Field Using the Method of Elementary Current Systems and Planar Earth Models : Volume 22, Issue 1 (01/01/2004)  
Author: Viljanen, A.
Volume: Vol. 22, Issue 1
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Group, B. W., Amm, O., Pirjola, R., Pulkkinen, A., Korja, T., & Viljanen, A. (2004). Fast Computation of the Geoelectric Field Using the Method of Elementary Current Systems and Planar Earth Models : Volume 22, Issue 1 (01/01/2004). Retrieved from http://www.netlibrary.net/


Description
Description: Finnish Meteorological Institute, Geophysical Research Division, P.O.B. 503, FIN-00101 Helsinki, Finland. The method of spherical elementary current systems provides an accurate modelling of the horizontal component of the geomagnetic variation field. The interpolated magnetic field is used as input to calculate the horizontal geoelectric field. We use planar layered (1-D) models of the Earth's conductivity, and assume that the electric field is related to the local magnetic field by the plane wave surface impedance. There are locations in which the conductivity structure can be approximated by a 1-D model, as demonstrated with the measurements of the Baltic Electromagnetic Array Research project. To calculate geomagnetically induced currents (GIC), we need the spatially integrated electric field typically in a length scale of 100km. We show that then the spatial variation of the electric field can be neglected if we use the measured or interpolated magnetic field at the site of interest. In other words, even the simple plane wave model is fairly accurate for GIC purposes. Investigating GIC in the Finnish high-voltage power system and in the natural gas pipeline, we find a good agreement between modelled and measured values, with relative errors less than 30% for large GIC values.

Key words. Geomagnetism and paleomagnetism (geomagnetic induction; rapid time variations) – Ionosphere (electric field and currents)


Summary
Fast computation of the geoelectric field using the method of elementary current systems and planar Earth models

 

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