Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6554h&link_type=abstract
Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6554-6558.
Physics
104
Atmospheric Physics, Earth Magnetosphere, Planetary Rotation, Planetology, Plasma Dynamics, Birkeland Currents, Earth Rotation, Electrical Resistivity, Inertia, Jupiter Atmosphere, Torque
Scientific paper
Corotation of a planetary magnetosphere with the rotational frequency of the planet is maintained by the viscous torque exerted by ion-neutral collisions in the planetary atmosphere, the torque being transmitted to the magnetosphere by Birkeland currents. In a steady state, this torque balances the inertial drag associated with the production and/or outward transport of magnetospheric plasma. The viscous torque in the atmosphere requires some departure from rigid corotation, i.e., some difference between the average rotation velocities of the ionospheric plasma and of the unionized atmosphere. In the present paper, the inertial corotation lag is calculated as a function of radial distance in the magnetosphere, the solution being parameterized in terms of the Pedersen conductivity of the atmosphere and the rate at which plasma mass is produced and transported outward in the magnetosphere.
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