Properties of ion-cyclotron waves and mirror modes observed in the Saturnian middle magnetosphere

Details Properties of ion-cyclotron waves and mirror modes observed in the Saturnian middle magnetosphere Properties of ion-cyclotron waves and mirror modes observed in the Saturnian middle magnetosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23c1632r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23C-1632

Physics

[5443] Planetary Sciences: Solid Surface Planets / Magnetospheres, [5759] Planetary Sciences: Fluid Planets / Rings And Dust, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites

Scientific paper

Ion-cyclotron waves (ICW) and mirror modes waves (MMW) have been observed by the Cassini spacecraft in Saturn's middle magnetosphere. ICW have frequencies close to gyro-frequencies of water group ions, they are left-handed, and in most regions propagate at small angles to the ambient magnetic field. There are some regions where ICW have been observed with frequencies at twice the fundamental gyro-frequency and propagate at oblique angles. We interpret these waves as a harmonic mode (HM). MMW are compressive waves characterized by strong deeps in magnetic field magnitude which are anti-correlated with the density. Both type of waves have a common origin which requires anisotropy in the plasma temperature (pressure) (Tperp/T‖>>1). In this work we analyze several Cassini's orbits, with a low inclination angle <0.5o, during year 2005. The data were obtained with the MAG and CAPS instruments. We analyze wave properties and study their region of occurrence. We have observed ICW between 4.7RS and 5.5RS, and ICW+HM between 3.8RS and 5.5RS, while the MMW can appear between 6RS and 6.9RS, with respect to Saturn. Additionally, we use linear kinetic theory to determine conditions for wave growth in a plasma resembling the E-ring region close to Enceladus. We find that ICW can occur for a wide range of parameter values (density, temperature anisotropy or pickup velocity). We investigate conditions needed for mirror mode growth.

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