Computer Science
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1187h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 31, Oct. 1983, p. 1187-1198.
Computer Science
34
Auroras, Dynamo Theory, Faraday Effect, Solar Planetary Interactions, Uranus Atmosphere, Birkeland Currents, Planetary Ionospheres, Planetary Rotation, Polar Caps, Solar Wind, Uranus, Auroras, Dynamo, Solar Wind, Flow, Magnetosphere, Power, Kinetics, Rotation, Currents, Electrical Properties, Polar Regions, Dipoles, Magnetic Moments, Ionosphere, Conductivity, Emissions, Iue, Lyman-Alpha Radiation, International Ultraviolet Explorer, Source
Scientific paper
A mechanism is proposed whereby the solar wind flowing past the magnetosphere of Uranus causes a Faraday disk dynamo topology to be established and power to be extracted from the kinetic energy of rotation of Uranus. An immediate consequence of this dynamo is the generation of Birkeland currents that flow in and out of the sunlit polar cap with the accompanying production of polar aurora. The power extracted from planetary rotation is calculated as a function of planetary dipole magnetic moment and the ionospheric conductivity of Uranus. For plausible values of ionospheric conductivity, the observed auroral power requires a magnetic moment corresponding to a surface equatorial field of the order of 4 Gauss, slightly larger than the value 1.8 Gauss given by the empirical 'magnetic Bodes law'.
Dessler A. J.
Hill Thomas W.
Rassbach M. E.
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