The Intrinsic Magnetic Fields of Saturn and Jupiter: How different are they from the geomagnetic field?

Details The Intrinsic Magnetic Fields of Saturn and Jupiter: How different are they from the geomagnetic field? The Intrinsic Magnetic Fields of Saturn and Jupiter: How different are they from the geomagnetic field?

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..174c&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.174

Physics

Scientific paper

Better characterization the magnetic field of Jupiter is possible with current better understanding of the magnetospheric current systems in the Jovian magnetosphere. Both Pioneer 11 and Galileo measured the field inside Io's orbit; these measurements placed important constraints on the main intrinsic field. Galileo magnetometer measured the field continuously over 7 years (Dec 1995 - Sep 2003); these measurements are the most important dataset for studying the secular variation rate of the field. As in our Saturn study, the contributions to the measured magnetic field from various sources in the magnetosphere are modeled and removed orbit by orbit. A more realistic shape of the magnetodisk is taken into account. The secular variation rate of the dipole term is then investigated based on yearly grouped observations. No clear secular variation trend is found, and tighter upper limits on the secular variation rate are placed. Possible uncertainties in the IAU definition of the rotation rate of the planet are investigated as well. Constraints on the interior and evolution models of Jupiter and Saturn are placed from the various characteristics of the intrinsic magnetic fields extracted in this study.

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