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ring current

   Also found in: Wikipedia 0.01 sec.
ring current [′riŋ ‚kə·rənt]
(geophysics)
A westward electric current which is believed to circle the earth at an altitude of several earth radii during the main phase of geomagnetic storms, resulting in a large worldwide decrease in the geomagnetic field horizontal component at low latitudes.


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After a brief historical review of early ring current studies, 32 papers on the physics and structures of the earth's inner magnetosphere are organized into sections that deal with the sources and losses of plasma and energetic particles in the inner magnetosphere, energetic particle acceleration mechanisms, external driving mechanisms of the inner magnetosphere, observational aspects of inner magnetosphere dynamics, and large-scale modeling efforts of the inner magnetosphere.
By linking to currents much closer to Earth, the ring current plays a pivotal role in disturbing power grids on the ground.
On July 20, the high-field superconducting ring, which will be magnetically levitated for several hours in a large vacuum vessel, was tested to a total ring current of 1.
 
 
 
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