Physics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9607s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9607-9620.
Physics
7
Convective Flow, Magnetosphere-Ionosphere Coupling, Planetary Magnetic Fields, Planetary Magnetospheres, Uranus Atmosphere, Electric Fields, Ionospheric Currents, Magnetic Dipoles, Polar Caps
Scientific paper
A method for determining the magnetospheric convection electric field using simple analytic approximations under the assumption of uniform ionospheric conductivity is described, and applied to Uranus. Magnetic field models including quadrupole and octupole moments are used to determine the shape of the polar caps and the mapping of the electric field and parallel currents between ionosphere and magnetosphere. The asymmetry in the magnetic field models between the northern and southern hemispheres leads to the inclusion of currents between the hemispheres in order to satisfy the assumption of equipotential magnetic field lines. The results show that the quadrupole moment of the Uranian magnetic field strongly influences magnetospheric convection, and that a significant octupole moment will further alter the flow pattern.
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