Joule heating of the Jovian ionosphere by corotation enforcement currents

Details Joule heating of the Jovian ionosphere by corotation enforcement currents Joule heating of the Jovian ionosphere by corotation enforcement currents

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9945n&link_type=abstract

Journal of Geophysical Research, vol. 86, Nov. 1, 1981, p. 9945-9952.

Astronomy and Astrophysics

Astronomy

17

Atmospheric Heating, Jupiter Atmosphere, Ohmic Dissipation, Planetary Ionospheres, Resistance Heating, Astronomical Models, Atmospheric Models, Energy Transfer, Plasma Heating, Rates (Per Time), Rotating Fluids, Jupiter, Heating, Ionosphere, Corotation, Currents, Magnetosphere, Data, Mathematical Models, Magnetodisc, Plasmas, Rotation, Angular Momentum, Energy, Velocity, Asymmetry, Trajectories, Diffusion, Dissipation, Comparisons, Dynamics, Conductivity, Distance, Latitude, Compression

Scientific paper

A simple magnetodisk model is used to estimate the Joule heating rate, for several causes of departure from the corotation during whose enforcement heat is deposited on the Jovian magnetosphere. Following compression or expansion of the magnetosphere, the magnetospheric plasma sub- or super-rotates due to conservation of angular momentum and thermal energy is deposited in the ionosphere at a rate of 10 to the 12th W for 100,000 sec while rotational speed is adjusted toward the corotation with the planet. Day-night asymmetry in trajectory of rotational motion of plasma, due to magnetospheric configuration asymmetry, may also produce energy dissipation of a similar magnitude as the rotational speed is adjusted. The corotation enforcement current therefore deposits as much heat as the dynamo current from Io, and plays an important role in the energetics and dynamics of the Jovian magnetosphere.

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