Using the ``Current-Free'' Magnetospheric Field Measurements to Model the Internal Field of Jupiter and Deduce its Rotation Rate

Details Using the ``Current-Free'' Magnetospheric Field Measurements to Model the Internal Field of Jupiter and Deduce its Rotation Rate Using the ``Current-Free'' Magnetospheric Field Measurements to Model the Internal Field of Jupiter and Deduce its Rotation Rate

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgp23b1011r&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #GP23B-1011

Physics

[1510] Geomagnetism And Paleomagnetism / Dynamo: Theories And Simulations, [1595] Geomagnetism And Paleomagnetism / Planetary Magnetism: All Frequencies And Wavelengths, [5734] Planetary Sciences: Fluid Planets / Magnetic Fields And Magnetism, [6220] Planetary Sciences: Solar System Objects / Jupiter

Scientific paper

Scalar potentials can be used to model magnetic fields in regions where there are no significant currents, such as in the atmosphere of the Earth. To use this approach in the magnetosphere of Jupiter, we should restrict our attention to the regions not affected by mass-loading moon Io. Thus we use magnetic field observations only inside the region of field lines reaching 5.8 jovian radii. For this purpose, we use a data set from Pioneer 10 and 11 that is dominated by the close (1.6 RJ) retrograde pass of Pioneer 11. Voyager and Ulysses provide little additional data as they did not make close approaches to Jupiter. Galileo obtained some data in this radial range at orbit insertion and late in the mission. We use these data to create a best-fit internal degree 4 model, with an external dipole term. From the apparent shift of the longitude of the internal dipole moment between the Pioneer epoch and the Galileo epoch, we refine the rotation rate of Jupiter. We also compare our result with previous analyses inverting data obtained in the current containing region and find a significant change in the dipole moment possibly because of underestimation of the effect of the Io torus on the inversion.

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