Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.5763b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 1, 1987, p. 5763-5767.
Physics
3
Magnetic Dipoles, Planetary Magnetic Fields, Planetary Magnetospheres, Saturn Atmosphere, Current Sheets, Dipole Moments, Magnetopause, Pioneer 11 Space Probe, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Saturn, Magnetosphere, Spacecraft Observations, Pioneer 11, Voyager 1, Voyager 2, Magnetic Fields, Dipole, Technique, Current Sheets, Models, Magnetopause, Magnetic Properties, Thickness, Calculations, Parameters
Scientific paper
Pioneer 11 and Voyager 1 and 2 magnetic field measurements over the entire flyby of Saturn's magnetic field have been analyzed by fitting a magnetospheric dipole field (i.e., a dipole field plus the field due to currents in the magnetopause), higher moments of the internal field aligned with the dipole along the rotation axis, and the field due to an equatorial sheet current to the magnetic measurements. A dipole moment of 21,431 nT R(s) exp 3, a quadrupole moment of 2403 nT R(s) exp 4, an octopole moment of 2173 nT R(s) exp 5, and an equatorial sheet current of half thickness 2.0 R(s) from about 5 R(s) to the solar edge of the magnetopause, fit the measurements over the entire magnetosphere with an rms deviation of 3.2 nT where R(s) is the planet radius, 66,330 km. The primary feature of the present analysis is the explicit inclusion of the calculated magnetopause current field, which reduces the overall rms deviation over the entire flyby from sigma values of 4.7 and 5.9 nT, using previous models, to 3.2 nT using the present.
Beard David B.
Gast M. A.
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