Physics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286...40i&link_type=abstract
Nature, vol. 286, July 3, 1980, p. 40-43.
Physics
Io, Jupiter Atmosphere, Planetary Magnetospheres, Plasma Acceleration, Plasma Clouds, Flow Velocity, Ionospheric Propagation, Magnetohydrodynamic Flow, Oxygen Ions, Sulfur, Jupiter, Plasmas, Disks, Sulfur, Oxygen, Ions, Satellites, Io, Ejecta, Magnetosphere, Models, Acceleration, Corotation, Temperatures, Ionization, Toruses, Diffusion, Heating, Cooling, Velocity, Analysis, Observations, Emissions, Comparisons, Geometry, Magnetohydrodynamics
Scientific paper
The process of local acceleration of the plasma cloud freshly ejected from Io into the jovian magnetosphere is considered. A physical model previously employed to investigate the motion of artificial barium cloud estimates the time scale for such transient acceleration. In normal conditions, the new ions could be accelerated to full corotation within about 300 s of injection. But the corresponding time scale might be increased 10-fold at the peaks of mass injection. In this way the observations of non-rigid corotation of the S(+) ions of sporadic nature may be understood. The temperature and ionization discontinuities in the Io torus as observed by the Voyager experiments is also considered. It is proposed that such a sharp transition is related to the coupling of the radial diffusion and heating plus cooling of the thermal plasma.
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