Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9110995v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 10995-11002.
Physics
12
Birkeland Currents, Earth Magnetosphere, Field Aligned Currents, Lines Of Force, Magnetic Field Configurations, Planetary Magnetic Fields, Uranus Atmosphere, Geomagnetic Tail, Magnetohydrodynamic Stability, Magnetopause, Planetary Ionospheres, Voyager 2 Spacecraft
Scientific paper
Field-aligned Birkeland currents and the angle of the magnetic line twist were calculated for an axially symmetric pole-on magnetosphere (assumed to be in MHD equilibrium). The angle of the field line twist was shown to have a strong radial dependence on the axisymmetric magnetotail as well as on the ionospheric conductivity and the amount of thermal plasma contained in closed magnetotail flux tubes. The field line twist results from the planetary rotation, which leads to the development of a toroidal magnetic B-sub-phi component and to differentially rotating magnetic field lines. It was shown that the time development of the toroidal magnetic B-sub-phi component and the rotation frequency are related through an induction equation.
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