Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work...31v&link_type=abstract
In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 31-35(SEE N89-24910 18-75)
Astronomy and Astrophysics
Astrophysics
Dimensionless Numbers, Parameterization, Planetary Evolution, Planetary Magnetospheres, Plasma Interactions, Solar Wind, Astronomical Models, Auroras, Dipole Moments, Gravitational Effects, Heliosphere, Plasma Diagnostics, Solar Terrestrial Interactions
Scientific paper
For a systematic comparison of the various observed magnetospheres and related systems, their basic parameters are expressed in dimenionless, unit-independent form. The planetary magnetic dipole moment and the internal plasma source strength, recast as dimensionless variables, provide a unified overview of solar wind interactions with a variety of objects from strongly magnetic planets to comets. The radius of a planet has little significance for the magnetosphere in general, but a magnetosphere large compared to the planet may be needed in order to concentrate currents sufficiently to trigger auroral acceleration. A dimensionless measure of gravitational effects shows that they are important in magnetospheres of distant astrophysical objects but unimportant in magnetospheres within the present-day solar system; magnetospheres, if any, during the formative phases of the solar system must therefore have been qualitatively different.
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