Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9020h&link_type=abstract
Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 9020-9028.
Astronomy and Astrophysics
Astronomy
97
Convective Flow, Earth Magnetosphere, Io, Jupiter Atmosphere, Plasma Interactions, Rotating Plasmas, Space Plasmas, Gas Injection, Ionospheric Conductivity, Magnetohydrodynamic Flow, Planetary Ionospheres, Planetary Rotation, Satellite Atmospheres, Toroidal Plasmas
Scientific paper
The longitudinal asymmetry of the Io plasma torus, as predicted by the magnetic-anomaly model and observed by earth-based optical astronomy, provides a driving mechanism for a corotating convection system in Jupiter's magnetosphere. The global nature of this convection system is described qualitatively, and a semiquantitative estimate of the convection time scale is deduced. The estimated convection time scale is comparable to a few Jovian rotation periods, from which it is concluded that the convection represents the dominant radial transport mechanism in the Jovian magnetosphere and the dominant mechanism for extracting energy from Jupiter's rotation for driving a wide variety of magnetospheric phenomena. It is also concluded that both the Jovian ionospheric conductivity and the plasma injection rate in the Io plasma torus must be considerably larger than previous estimates in order to make the estimated convection time scale consistent with observations and previous theoretical work. It is indicated that a similar corotating convection system may occur in other rotation-dominated magnetospheres, such as those of pulsars and Saturn.
Dessler A. J.
Hill Thomas W.
Maher J. Jr. L.
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