
The magnetopause is the abrupt boundary between a magnetosphere and the surrounding plasma. For planetary science, the magnetopause is the boundary between the planet’s magnetic field and the solar wind. The location of the magnetopause is determined by the balance between the pressure of the dynamic planetary magnetic field and the dynamic pres...
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http://en.wikipedia.org/wiki/Magnetopause

The boundary space between the earths magnetosphere and interplanetary space (40,000 miles / 65,000 km) above the earth, marked by an abrupt decrease in the earths magnetic induction.
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http://planetfacts.org/space-terms/

The boundary of the magnetosphere, lying inside the bow shock. The location in space where Earth's magnetic field balances the pressure of the solar wind. It is located about 63,000 km from Earth in the direction of the Sun.
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http://www.braeunig.us/space/glossary.htm

(from the article `ionosphere and magnetosphere`) ...escaping from Earth`s gravity is comparable to the opposing pressure associated with the solar wind. This equilibrium region, with a ... ...solar windthe flux mainly of protons and electrons escaping from the Sun`s gravitational field. This equilibrium region, with a characteris...
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http://www.britannica.com/eb/a-z/m/11

The boundary between a planet`s magnetosphere and the magnetic field of the solar wind. It forms at a distance where the solar wind dynamic pressure equals the magnetic pressure of the planet`s field. In the case of Earth, this is typically 8 to 11 Earth radii upwind, depending on solar wind conditi...
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http://www.daviddarling.info/encyclopedia/M/magnetopause.html

the outer boundary of the magnetosphere
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-06-18

The boundary layer between the SOLAR WIND and the MAGNETO- SPHERE.
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http://www.encyclo.co.uk/visitor-contributions.php

The boundary of the magnetosphere, lying inside the bow shock .
Found on
http://www.solarviews.com/eng/terms.htm

magnetopause The outer layer of the earth's magnetosphere, bordering the solar wind.
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http://www.wordinfo.info/words/index/info/view_unit/1236/3
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