Statistics – Computation
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..497p&link_type=abstract
In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:
Statistics
Computation
Space Weather
Scientific paper
A space storm creates intense rapidly-varying currents in the ionosphere. The most important are auroral electrojet systems. At the Earth's surface, the currents cause a geomagnetic disturbance and an induced electric field. Besides the primary space currents, the surface fields are also affected by secondary currents flowing in the Earth. The electric field drives harmful "geomagnetically induced currents" (GIC) in technological systems with a possibility of large economic losses. The first observations of space weather effects on technological systems were already made in early telegraph equipment 150 years ago. Theoretical modelling of GIC in a technological system firstly requires a "geophysical" calculation of the electric field at the Earth's surface and secondly an "engineering" computation of GIC in the particular earthed network of conductors. In this paper, we summarize the basic principles associated with GIC and consider the research done on the topic in Finland for almost twenty-five years.
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