Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm24a..08k&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM24A-08
Other
5443 Magnetospheres (2756), 2732 Magnetosphere Interactions With Satellites And Rings, 2736 Magnetosphere/Ionosphere Interactions, 2756 Planetary Magnetospheres (5443, 5737, 6030), 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
The global scale structure of the Jovian magnetosphere has been established through analysis of data from seven spacecraft whose collective passes cover all local times, mainly in the near-equatorial region. As contrasted with Earth's magnetosphere and auroral ionosphere, where the day-night asymmetries dominate the local time variation of structure, the Jovian magnetosphere and auroral ionosphere also reveal strong dawn-dusk asymmetries. Those asymmetries illuminate the effects of plasma rotation in the presence of externally imposed forces at the magnetopause. Analysis of the system leads to a description of the physical processes that produce the asymmetry and gives insight into unique aspects of the plasma transport in a magnetosphere dominated by rotation. The most dynamic portion of the magnetosphere is the plasma disk. At some local times, its outer edge is marginally stable and at others strongly unstable. The most unstable sector is localized on the night side, where an outflow of material down tail thins the plasma disk. The same outflow evacuates portions of the flux tubes, causing the outer portions to break off and leave closed depleted flux tubes behind. As the depleted flux tubes move on to the dayside at large radial distance on the morning side, they form a distinct plasma/magnetic regime. The residual sheet thickens as flux tubes rotate to noon. During this rotation, there is some evidence of weak loss of plasma. A massive change takes place in the afternoon sector where the sheet energizes and thickens as it moves from noon to dusk and assimilates the empty flux tubes of the outer magnetosphere. It is probable that this assimilation is accomplished through a short perpendicular scale centrifugally driven ballooning leading to Bohm diffusion of plasma to refill the previously emptied tubes. The well-known dawn dusk asymmetry in the UV aurora is very likely associated with the vastly larger tapping of the ionospheric `flywheel' in the afternoon sector that the model proposes.
Galland Kivelson Margaret
Southwood David J.
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