Limit on rotational energy available to excite Jovian aurora

Details Limit on rotational energy available to excite Jovian aurora Limit on rotational energy available to excite Jovian aurora

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7.1085e&link_type=abstract

Geophysical Research Letters, vol. 7, Dec. 1980, p. 1085-1088.

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44

Auroras, Io, Jupiter Atmosphere, Planetary Rotation, Space Plasmas, Charged Particles, Magnetohydrodynamic Flow, Toroidal Plasmas, Vlasov Equations

Scientific paper

There is a fundamental relationship between the power that is extracted from Jupiter's rotation to drive magnetospheric processes and the rate at which mass is injected into the Io plasma torus. Half of this power is consumed by bulk motion of the plasma and the other half represents an upper limit on the energy from rotation available for dissipation and in particular to excite the Jovian aurora. Since the rotation of the planet is the only plausible source of energy, the power inferred from the observed auroral intensities requires a plasma injection rate of 2.6 x 10 to the 29th AMU/sec or greater. This in turn leads to a residence time of a torus particle of 48 days or less. These results raise doubts about the applicability of equilibrium thermodynamics to the determination of plasma parameters in the Io torus.

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