Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p52b..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P52B-02
Physics
2756 Planetary Magnetospheres (5443, 5737, 6033), 5719 Interactions With Particles And Fields, 5737 Magnetospheres (2756), 6270 Pluto And Satellites, 6280 Saturnian Satellites
Scientific paper
The regular magnetic perturbations in Saturn's magnetosphere have been shown to require source currents flowing in regions external to the planet. The perturbations are also consistent with a rotating source where the current varies with azimuth around the planet as cos φ. From the low latitude data, one deduces that the current seems to cross the equatorial plane and flow from ionosphere to ionosphere on magnetic L-shells in the region 10 to 15. Near the equator, such a current system produces roughly the same perturbations as one with the same azimuthal symmetry flowing on the surface of a sphere of radius 10 to 15 RS, implying that inside the current-carrying shell the perturbation field is uniform and that outside it has the form of an equatorial dipole. Indeed, beyond L=15, but near the equator, the field corresponds approximately to that of an internal dipole tilted by roughly 10 degrees and modified by local plasma contributions. At high latitudes, the spherical model is not applicable and so deductions based on it cannot be made. Evidence for this is seen in the response of the auroral emissions to planetary rotation. Auroral emissions associated with a tilted dipole, as at Earth, move relative to the spin axis as the planetary dipole rotates. At Saturn the auroral emissions move little relative to the spin axis as the planet rotates. The lack of response to the cam currents at high latitudes can be understood by considering current paths in the polar regions, as we shall discuss in this talk.
Galland Kivelson Margaret
Southwood David J.
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