Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39.1259a&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 39, Sept. 1991, p. 1259-1262.
Other
Dynamo Theory, Magnetic Dipoles, Neptune (Planet), Planetary Magnetic Fields, Spherical Harmonics, Uranus (Planet), Magnetic Moments, Mathematical Models, Photosphere, Planetary Rotation, Solar Planetary Interactions
Scientific paper
It is shown that the offset tilted dipole model of Uranus and Neptune, deduced from the spherical harmonic analysis of the Voyager magnetic field observation, can be represented fairly well by the combined field of an axial and an auxiliary dipole; the latter is roughly oriented in the east-west direction and is located near the surface of the core in low latitude. The present dynamo theories of planetary magnetism consider an axial dipolar field as an essential element, since the planetary rotation plays a vital role in the dynamo process. On the other hand, the auxiliary dipoles may be a result of leakage of the toroidal field, like a pair of sunspots on the photosphere, which is also an essential part of the dynamo process.
Akasofu Syuh-Ichi
Lee Hong Lim
Saito Takesi
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