Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1203a&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Sept. 1990, p. 1203-1206.
Physics
1
Dipole Moments, Earth Axis, Earth Rotation, Geomagnetism, Magnetic Dipoles, Axes Of Rotation, Magnetic Field Configurations, Planetary Magnetic Fields, Planetary Rotation, Spherical Harmonics
Scientific paper
Planetary exploration by deep space probes in recent years has shown that the dipole moment of some magnetized planets has a surprisingly large inclination angle with respect to the rotation axis. Applying the method developed for the source surface magnetic field of the sun (a spherical surface of 2.5 solar radii), it is suggested that the main dipole of the earth and the magnetized planets may actually be axial (the magnetic moment being parallel or antiparallel to the rotation axis), and that two or three smaller dipoles near the core surface could be responsible for the apparent inclination of the main dipole. In formulating a dynamo theory of the planetary magnetic field, such a possibility should be considered, as well as the inclined dipole case.
Akasofu Syuh-Ichi
Saito Takesi
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