The plasmasphere, or inner magnetosphere, is a region of the Earth`s magnetosphere consisting of low energy (cool) plasma. It is located above the ionosphere. The outer boundary of the plasmasphere is known as the plasmapause, which is defined by an order of magnitude drop in plasma density. ...
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http://en.wikipedia.org/wiki/Plasmasphere
Area of cold and high density plasma above the ionosphere.
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http://planetfacts.org/space-terms/
The region of the atmosphere consisting of cold dense plasma originating in the ionosphere and trapped by the Earth's magnetic field.
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http://www.braeunig.us/space/glossary.htm
A donut-shaped region of relatively cool (2,000 K), dense (tens to thousands of particles per cm³) plasma within Earth's magnetosphere that extends out to a distance of about 4 Earth radii (25,000 km) and is bounded by the inner Van Allen belt. The outer limit of the plasmasphere is called the ...
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http://www.daviddarling.info/encyclopedia/P/plasmasphere.html
that ionized region, toroidal in shape, which encircles the Earth around the equator and which follows the rotation of the Earth NOTE - In the equatorial plane, the plasmasphere extends to a distance of 3 to 7 Earth radii depending on local time and geomagnetic activity.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-06-15
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