Structure, Variation and Pressure Balance in the Saturnian Plasma Sheet. Combined MIMI, CAPS and MAG Measurements From Cassini

Details Structure, Variation and Pressure Balance in the Saturnian Plasma Sheet. Combined MIMI, CAPS and MAG Measurements From Cassini Structure, Variation and Pressure Balance in the Saturnian Plasma Sheet. Combined MIMI, CAPS and MAG Measurements From Cassini

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm32a..04s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM32A-04

Statistics

Computation

2756 Planetary Magnetospheres (5443, 5737, 6033), 5734 Magnetic Fields And Magnetism, 5737 Magnetospheres (2756), 6275 Saturn, 7845 Particle Acceleration

Scientific paper

Combined plasma, energetic particle and magnetic field measurements, obtained by the Magnetospheric Imaging Instrument (MIMI), the Cassini Plasma Spectrometer (CAPS) sensors and the magnetometer (MAG) respectively, are used to study the Saturnian plasma sheet as revealed through 2 nearly vertical passes of Cassini (days 8/2007 to 42/2007) during its high latitude orbits. Trajectories of such geometry favor the clear detection of the plasma sheet boundaries, both through magnetic field and particle data. As the in-situ Cassini measurements offer complete energy coverage (eV to MeV) of the cold plasma and the energetic particle population, where present, the computation of the particle temperature and total plasma pressure is made possible. The extent and temporal variation of the plasma sheet is examined, and its scale height is calculated for the cold plasma and the energetic particle population, using different methods (e.g. exponential decay, Harris profile), per ion specie where possible. Initial results indicate that the dayside plasma sheet is wide in latitude (±45 deg) and extends up to the magnetopause, with its pressure decreasing with radial distance. The night side plasma sheet appears to be much thinner, with a larger scale height for energetic ions (2Rs) compared to the cold-warm plasma (1Rs). Plasma beta is kept close to or above 1 inside the plasma sheet region, outside ~8 Rs. Furthermore, based on combined plasma density, particle pressure and magnetic field measurements, the stress balance inside the plasma sheet is also addressed.

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