Physics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8429g&link_type=abstract
Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8429-8434.
Physics
15
Current Sheets, Geomagnetic Tail, Jupiter Atmosphere, Magnetohydrodynamic Waves, Planetary Magnetic Fields, Planetary Magnetospheres, Solar Activity Effects, Atmospheric Models, Particle Flux Density, Solar Terrestrial Interactions, Solar Wind Velocity, Voyager 1 Spacecraft, Jupiter, Magnetotail, Current Sheets, Motion, Pioneer 10, Voyager 1, Particles, Flux, Magnetic Fields, Geometry, Magnetosphere, Latitude, Radial Distance, Solar Wind, Pressure, Theoretical Studies, Corotation, Plasmas, Flow, Mass Transp
Scientific paper
From the observed times when Pioneer 10 and Voyager 1 observe particle flux maxima and minima and when the magnetic field strength is at minimum a geometric description of the current sheet in Jupiter's magnetosphere is derived. It lags the planetary rotation by an angle delta which varies as a function of radial distance as delta equals 22 deg + 0.80 (r - 16.3). The maximum latitude of the current sheet is roughly 10 deg inside of 60 Jovian radii and decreases beyond. Thus there is a hinge point near 60 Jovian radii. The position of the hinge point moves in response to the external solar wind pressure variation. The variation of delta(r) is discussed theoretically and how it is related to the magnetic field topology and plasma flow is shown. It is concluded that the distant field lines do not corotate with Jupiter and that the Alfven speed at 50 Jovian radii is of the order of 1500 km/s. The topology of the current sheet is affected by centrifugal forces, outward mass transport and solar wind-magnetosphere interaction. It is shown how these effects can be related to different current systems.
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