Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23c1623m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM23C-1623
Physics
[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2756] Magnetospheric Physics / Planetary Magnetospheres
Scientific paper
We study the azimuthal plasma velocity in Saturn's magnetosphere between 3 and 13 Saturnian radii by analysing energetic particle injection events using data of the Magnetospheric Imaging Instrument (MIMI) onboard the Cassini spacecraft. During such events high energetic plasma is transported into the inner part of the magnetosphere. This transport may be evoked by the interchange instability which could be identified as the generation process of injections near Io in the Jovian system. Due to the magnetic drifts, the injected particles begin to disperse and leave an imprint in the electron as well as in the ion spectrograms of the MIMI data. The shape of these profiles strongly depends on the azimuthal velocity distribution of the magnetospheric plasma and the age of the injection event. Comparison of theoretically computed dispersion profiles with observed ones enables us to characterize the azimuthal flow of the plasma. The measured flow profile clearly shows that the plasma tends to subcorotate. Knowledge of the flow profile and the ages of each injection event enables us to calculate the location where the energetic particles were injected into the inner magnetosphere. The night and morning sector are favoured by injections.
Krimigis Stamatios M.
Krupp Norbert
Mitchell Donald G.
Mueller Alfred
Saur J. S.
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