Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.8771a&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 8771-8778.
Astronomy and Astrophysics
Astronomy
33
Astronomical Models, Planetary Magnetic Fields, Saturn (Planet), Zonal Harmonics, Axes Of Rotation, Pioneer 11 Space Probe, Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
The planetary magnetic field of Saturn has been studied by the spacecraft Pioneer 11 in 1979, Voyager 1 in 1980, and Voyager 2 in 1981. The field is found to be primarily dipolar and axially coincident with the rotation axis, but with significant quadrupole and octupole moments. The harmonic terms are g1(0) = 21535 nT, g2(0) = 1642 nT, and g3(0) = 2743 nT. This model field, Z3, in conjunction with a model for an equatorial ring current, represents very precisely the in situ magnetic-field measurements and data on charged-particle absorption by satellites and rings within 8 Saturn radii of the planet. However, this axisymmetric model fails to explain the periodic modulation of Saturn's kilometric radiation or Saturn's electrostatic discharges. This enigma of Saturn's magnetosphere remains unsolved in spite of extensive reconsideration of all available data bearing on this issue.
Acuña Mario Humberto
Connerney Jack E. P.
Ness Norman F.
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