The Saturnian Ring Current as Revealed Through Combined Plasma, Energetic Particle and Magnetic Field Measurements. Inertial or Pressure Gradient Driven?

Details The Saturnian Ring Current as Revealed Through Combined Plasma, Energetic Particle and Magnetic Field Measurements. Inertial or Pressure Gradient Driven? The Saturnian Ring Current as Revealed Through Combined Plasma, Energetic Particle and Magnetic Field Measurements. Inertial or Pressure Gradient Driven?

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41b1655k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM41B-1655

Physics

2700 Magnetospheric Physics (6939), 2730 Magnetosphere: Inner, 2764 Plasma Sheet, 2778 Ring Current

Scientific paper

Combined data from the MAG, MIMI and CAPS instruments onboard Cassini are used to study the driving mechanism and physical characteristics of the ring current at Saturn. The Saturnian plasma environment is adequately sampled in the eV to MeV energy range with MIMI/CHEMS and LEMMS, and CAPS/IMS and ELS sensors. All available equatorial plane passes of Cassini are considered separately between radial distances of 6 and 17 RS, covering September 2005 to July 2006 (Rev 14 to 26) and June to September 2007 (Rev 46 to 49). Anti-symmetric local time sectors are compared where possible and an analysis of the observed orbit-to-orbit variations is also undertaken. Magnetic field modelling and a statistical approach are also employed to address each of the radial force balance equation terms and determine how their contributions to the total current vary with radial distance. Initial results suggest that the azimuthal current density attributed to the plasma pressure gradient reaches its maximum contribution to the total current density in the region 9-10 RS and appears comparable to the inertial current density term being of order of 10-11 A/m2.

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