The influence of centrifugal forces on the B field structure of an axially symmetric equilibrium magnetosphere

Details The influence of centrifugal forces on the B field structure of an axially symmetric equilibrium magnetosphere The influence of centrifugal forces on the B field structure of an axially symmetric equilibrium magnetosphere

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.8693y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, July 1, 1989, p. 8693-8706.

Physics

Atmospheric Physics, Centrifugal Force, Planetary Magnetospheres, Space Plasmas, Atmospheric Models, Birkeland Currents, Cold Plasmas, Geomagnetic Tail, Lines Of Force, Rotating Plasmas, Uranus Atmosphere

Scientific paper

A model is presented of an axially symmetric pole-on magnetosphere in MHD force balance, in which both plasma thermal pressure gradients and centrifugal force are taken into account. Assuming that planetary rotation leads to differentially rotating magnetotail field lines, the deformation of magnetotail field lines under the influence of both thermal plasma pressure and centrifugal forces was calculated. Analytic solutions to the Grad-Shafranov equation are presented, which include the centrifugal force term. It is shown that the nonrotational magnetosphere with hot thermal plasma leads to a field configuration without a toroidal B(phi) component and without field-aligned Birkeland currents. The other extreme, a rapidly rotating magnetosphere with cold plasma, leads to a configuration in which plasma must be confined within a thin disk in a plane where the radial magnetic field component B(r) vanishes locally.

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