Physics
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3418107c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 18, CiteID L18107
Physics
15
Planetary Sciences: Fluid Planets: Magnetospheres (2756), Magnetospheric Physics: Magnetosphere: Outer, Magnetospheric Physics: Plasma Sheet
Scientific paper
A magnetic axis that is tilted with respect to the spin axis causes waves that generate spin-periodic effects in a planet's outer magnetosphere. Saturn's magnetic axis is aligned with its spin axis, and yet its outer magnetosphere exhibits spin-periodicities in all species of charged particles, just as expected from a wavy magnetodisk. In a spin-aligned geometry, however, a rotating anomaly (or ``cam'') in the inner magnetosphere can also generate spin-periodic waves by shaking the plasma sheet of the outer magnetosphere. Like a wobbling magnetodisk, this model predicts oscillations of the plasma sheet at distances beyond ~20 RS (1 RS = 60268 km). When viewed from a moving spacecraft, these oscillations cause charged particle periodicities near the spin period of the planet. The phase and polarity of these periodicities should change systematically with local time, and spin-periodic effects should appear along the magnetopause.
Carbary James F.
Hamilton Douglas C.
Krimigis Stamatios M.
Krupp Norbert
Mitchell Donald G.
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