Hemisphere coupling currents at Enceladus: Analytical modeling of Cassini magnetometer observations

Details Hemisphere coupling currents at Enceladus: Analytical modeling of Cassini magnetometer observations Hemisphere coupling currents at Enceladus: Analytical modeling of Cassini magnetometer observations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11c1772s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11C-1772

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites

Scientific paper

The interaction between the neutral gas plume below the south pole of Enceladus and the plasma in Saturn’s inner magnetosphere is characterized by a pronounced north-south asymmetry. Although both hemispheres of Enceladus are not directly connected through magnetic field lines, they are electrodynamically coupled. The perturbations of the velocity and the magnetic field generated around the south polar plume are mapped in a modified way into the northern hemisphere. As suggested by previous analytical modeling (Saur et al., J. Geophys. Res., 112, A11209, doi: 10.1029/2007JA012479, 2007), this hemisphere coupling is carried by currents on the surface of the magnetic flux tube tangent to the solid body of Enceladus, resulting in the formation of a magnetic field discontinuity. We present Cassini Magnetometer (MAG) data from recent Enceladus flybys, confirming that such a discontinuity is indeed visible in the magnetic field observations. An improved analytical model of the surface current systems is developed, allowing to determine the intensity of the hemisphere coupling effect as a function of the spatially inhomogeneous plasma conductivities inside and outside the Enceladus flux tube. The key features of the magnetic field signatures obtained from the model are in good agreement with Cassini MAG data.

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