The characteristics of high-latitude field-aligned currents observed by Cassini in Saturn's magnetosphere

Details The characteristics of high-latitude field-aligned currents observed by Cassini in Saturn's magnetosphere The characteristics of high-latitude field-aligned currents observed by Cassini in Saturn's magnetosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13f..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13F-07

Physics

[2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [5737] Planetary Sciences: Fluid Planets / Magnetospheres

Scientific paper

During the years 2007-2009, the Cassini spacecraft monitored high latitude regions (50-75 degrees) of Saturn's magnetosphere near its periapsis passes at radial distances of < 10 RS. The magnetometer onboard Cassini recorded strong perturbations in the azimuthal component of the magnetic field during these passes suggesting passage of the spacecraft through strong sheets of field-aligned currents (FACs). The invariant latitude of the spacecraft was close to 70 degree and a variety of local times were crossed during the passages through the FACs. We have performed a statistical analysis of these currents to understand their dynamics and origin. It is seen that strong currents enforces corotation on the outflowing plasma. However, currents consistent with the "cam" current system and a rotating partial ring current system are also observed. We present a statistical analysis of all of these current types to understand their distribution in field-line L shell, SKR rotational phase and local time.

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