Other
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1393l&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1393-1401. Research supported by NSERC.
Other
3
Birkeland Currents, Energy Transfer, Jupiter Atmosphere, Magnetosphere-Ionosphere Coupling, Planetary Magnetospheres, Planetary Rotation, Corotation, Planetary Magnetic Fields, Steady State
Scientific paper
Jupiter exerts an enormous torque upon its magnetospheric plasma to force the latter to corotate. However, the corotation is generally not perfect due to internal production of plasma and/or its outward transport. In a steady state in which the magnetosphere rotationally lags behind the ionosphere, a Birkeland current system is formed to couple the two regions. This current is found to play a dual role in the magnetospheric energetics of Jupiter. On the one hand, it transfer energy from the planetary rotation to the magnetosphere; on the other hand, it returns part of this transferred energy back to the ionosphere to drive the ionospheric current required for the maintenance of the current system. Owing to this partition of energy, the magnetosphere gets only about one-third of the energy extracted from the planetary rotation, with the rest going to the ionosphere as Joule heating. The total energy delivery from the planetary rotation amounts to over 10 to the 14th W, considerably larger than the solar wind contribution.
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