The Z3 model of Saturn's magnetic field and the Pioneer 11 vector helium magnetometer observations

Details The Z3 model of Saturn's magnetic field and the Pioneer 11 vector helium magnetometer observations The Z3 model of Saturn's magnetic field and the Pioneer 11 vector helium magnetometer observations

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.7541c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Sept. 1, 1984, p. 7541-7544. Previously announced in STAR as N84-2762

Physics

20

Magnetic Fields, Payloads, Saturn (Planet), Voyager Project, Low Pass Filters, Perturbation, Pioneer 11 Space Probe, Planetary Magnetospheres, Spherical Coordinates, Zonal Harmonics, Saturn, Magnetic Fields, Models, Pioneer 11, Vector Helium Magnetometer, Observations, Zones, Harmonics, Voyager 1, Voyager 2, Comparisons, Flux Gate Magnetometer, Coordinate System, Equipment

Scientific paper

Magnetic field observations obtained by the Pioneer 11 vector helium magnetometer are compared with the Z3 model magnetic field. These Pioneer 11 observations, obtained at close-in radial distances, constitute an important and independent test of the Z3 zonal harmonic model, which was derived from Voyager 1 and Voyager 2 fluxgate magnetometer observations. Differences between the Pioneer 11 magnetometer and the Z3 model field are found to be small (approximately 1 percent) and quantitatively consistent with the expected instrumental accuracy. A detailed examination of these differences in spacecraft payload coordinates shows that they are uniquely associated with the instrument frame of reference and operation. A much improved fit to the Pioneer 11 observations is obtained by rotation of the instrument coordinate system about the spacecraft spin axis by 1.4 degree. With this adjustment, possibly associated with an instrumental phase lag or roll attitude error, the Pioneer 11 vector helium magnetometer observations are fully consistent with the Voyager Z3 model.

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