Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...28..479n&link_type=abstract
Icarus, vol. 28, Aug. 1976, p. 479-488.
Physics
38
Mercury (Planet), Planetary Magnetic Fields, Planetary Magnetospheres, Solar Wind, Bow Waves, Dynamo Theory, Field Strength, Magnetosheath, Mariner 10 Space Probe, Planetology, Shock Waves
Scientific paper
Magnetic-field observations made during the third encounter of Mariner 10 with Mercury are discussed along with implications of an intrinsic field for the planetary interior. The data obtained confirm the presence of characteristic bow-shock, magnetosheath, and magnetosphere regions surrounding the planet and also indicate that Mercury occupies a much larger portion of its magnetosphere than does earth. Combined plasma, charged-particle, and magnetic-field data establish that the origin of the field is intrinsic to the planet rather than associated with an induction process due to solar-wind flow. Spherical harmonic analysis of the field data shows that the internal field of the planet is well described by a centered dipole with a moment of 5.0 by 10 to the 22nd power gauss-cu cm and oriented within 12 deg of the normal to the orbital plane in the same sense as earth. Surface intensities are deduced to be between about 300 and 800 gammas. It is concluded that an active dynamo is a more likely candidate than fossil magnetization for the origin of the field.
Behannon Kenneth W.
Lepping Ronald P.
Ness Norman F.
Whang Yun C.
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