The Earth's Electrical Environment (1986) / Chapter Skim
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Pages 10-11
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From page 10... ...
Furthermore, above 70 km, collisions between electrons and air molecules become infrequent enough so that electrons are confined to spiral about a magnetic field line and the motion perpendicular to the field becomes more difficult than motion along the field. The electrical conductivity becomes anisotropic, and this anisotropy has a dominant influence on the electrical properties of the global circuit above 70 km.
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From page 11... ...
These fields are mainly confined to the polar caps because of the shielding from currents within the magnetosphere. During geomagnetic storms, however, the shielding currents can be altered and electric fields have been observed to propagate all the way from the polar caps to the equator.
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