Secular Change of the Jovian Magnetic Field: From Pioneer to Galileo

Details Secular Change of the Jovian Magnetic Field: From Pioneer to Galileo Secular Change of the Jovian Magnetic Field: From Pioneer to Galileo

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p43e..05y&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P43E-05

Physics

[5734] Planetary Sciences: Fluid Planets / Magnetic Fields And Magnetism, [6220] Planetary Sciences: Solar System Objects / Jupiter

Scientific paper

The jovian magnetic field has been probed by five flyby missions (Pioneer 10 and 11, Voyager 1 and 2, and Ulysses), and from 1995 - 2003 by the Galileo orbiter. We invert these data using the same technique to obtain a uniform-quality, robust estimate of seven coefficients of the jovian field over a quarter century. We use two Earth-flybys to validate the calibration of the Galileo magnetometer. We find no evidence for secular variation of the jovian field during this period, except changes due to the precision of the IAU 1965 period, the correct value of which we deduce to be 09h 55m 29.704 ± .003s. This value is inconsistent with the value obtained by Higgins et al. (1997) and recently adopted by the IAU and propagated into the JPL SPICE kernels. We recommend that the IAU 1965 period or our new determination be used and not the 1997 value.

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