New models of Saturn's magnetic field using Pioneer 11 Vector Helium Magnetometer data

Details New models of Saturn's magnetic field using Pioneer 11 Vector Helium Magnetometer data New models of Saturn's magnetic field using Pioneer 11 Vector Helium Magnetometer data

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1373d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1373-1380.

Astronomy and Astrophysics

Astronomy

13

Astronomical Models, Magnetometers, Pioneer 11 Space Probe, Planetary Magnetic Fields, Saturn (Planet), Drift Rate, Energetic Particles, Helium, Spherical Harmonics, Saturn, Magnetic Fields, Pioneer 11, Models, Helium Vector Magnetometer, Analysis, Harmonics, Comparisons, Currents, Magnetosphere, Magnetopause, Magnetotail, Bow Shock, Rings, Charged Particles, Calculations

Scientific paper

In a reanalysis of the Vector Helium Magnetometer data taken by Pioneer 11 during its Saturn encounter in 1979, using improvements in the data set and in the procedures, studies are made of a variety of models. The best is the P(11)84 model, an axisymmetric spherical harmonic model of Saturn's magnetic field within 8 Saturn radii of the planet. The appropriately weighted root mean square average of the difference between the observed and the modeled field is 1.13 percent. For the Voyager-based Z3 model of Connerney, Acuna, and Ness, this average difference from the Pioneer 11 data is 1.81 percent. The external source currents in the magnetopause, tail, bow shock, and perhaps ring currents vary with time and can only be crudely modeled. An algebraic formula is derived for calculating the L shells on which energetic charged particles drift in axisymmetric fields.

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