Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..425y&link_type=abstract
Planetary and Space Science, vol. 29, Apr. 1981, p. 425-429.
Physics
3
Earth Magnetosphere, Energy Transfer, Geomagnetism, Interplanetary Magnetic Fields, Solar Activity Effects, Solar Terrestrial Interactions, Solar Wind, Atmospheric Electricity, Coupling, Dynamo Theory, Electric Potential, Ionospheric Currents
Scientific paper
The energy coupling function between the solar wind and the magnetosphere can be obtained for two extreme situations, in which the magnetospheric geometry is determined primarily by either (1) the interplanetary magnetic field, or (2) the solar wind pressure. In this paper, an expression for the energy coupling function was obtained by assuming a simple interpermeation of the interplanetary and geomagnetic fields. Two important quantities in this case are the potential difference between the two neutral points and the amount of open flux. From these two overall quantities, the voltage and the current of the magnetospheric dynamo are calculated. The dynamo power output represents the rate at which energy is transferred from the solar wind to the magnetosphere. The derived functional dependence on the interplanetary conditions provides a theoretical basis for the energy coupling function previously deduced from observations.
Akasofu Syuh-Ichi
Kan Joseph R.
Yeh Tyan
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