Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm12a0827k&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM12A-0827
Other
2708 Current Systems (2409), 2740 Magnetospheric Configuration And Dynamics, 2756 Planetary Magnetospheres (5443, 5737, 6030), 2778 Ring Current, 5443 Magnetospheres (2756)
Scientific paper
Galileo has been surveying the magnetosphere of Jupiter since Dec. 1995 and has now collected magnetic field data from the dawn, midnight, and dusk sectors in a radial distance range of 6 to 100 RJ. The observations show that a well-developed current sheet exists in the Jupiter's magnetosphere at all radial distances surveyed. The observations also show a clear noon-midnight asymmetry in the strength of the current. We will use all of the magnetic data collected by Galileo and other spacecraft that have visited Jupiter to build a new magnetic field model of Jupiter's current sheet. We will subtract the contribution of the internal field of Jupiter by using the VIP4 model of Connerney et al. [1998]. We will use analytical models of disk-shaped current sheets similar to those advanced by Tsyganenko and Peredo [1994] for the Earth's current sheet. These models use an axially symmetric representation of the magnetic vector potential of a ring current to provide simple expressions for the calculation of magnetic field. Because the solutions are self-similar, several basic-modes can be constructed, each describing a ring current with different rate of outward decrease of the current density. The basic mode solutions are then combined in required proportions and fitted by least squares to the magnetic field observations. We will also discuss how we plan to further modify these models to include the effect of the hinging and warping of the current sheet due to the tilt of the Jovian dipole with respect to its rotation axis.
Khurana Krishan K.
Tsyganenko Nikolai A.
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