Unexpected periodic perturbations in Saturn's magnetic field data from Pioneer 11 and Voyager 2

Details Unexpected periodic perturbations in Saturn's magnetic field data from Pioneer 11 and Voyager 2 Unexpected periodic perturbations in Saturn's magnetic field data from Pioneer 11 and Voyager 2

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001adspr..28..919e&link_type=abstract

Advances in Space Research, Volume 28, Issue 6, p. 919-924.

Computer Science

3

Scientific paper

A direct comparison between the three magnetic field data sets from Saturn's magnetosphere is carried out. These data arise from the three spacecraft encounters with Saturn (Pioneer 11, Voyager 1 and 2). A standard planetocentric spherical polar coordinate system is used for the analysis. The inbound observations of the magnetic field from Pioneer 11 and Voyager 2 show a periodic perturbation of a few nanoTeslas (with a period close to the planetary rotation period) in the azimuthal component of the field, from the inbound magnetopause crossing to closest approach (~ 17 hours). The outbound observations present an equivalent feature only in the case of Pioneer 11, where the radial and azimuthal components of the field are perturbed throughout the whole outbound pass (~ 40 hours). A dipole tilt and/or current sheet crossings are unlikely causes for such periodic perturbations. A large scale ballooning of the magnetic field and plasma is a possible generating mechanism, and is used for the time-dependent scenario proposed here to explain the observed feature. The Pioneer 11 outbound magnetopause crossings may provide some evidence for such ballooning.

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