Waves and Instabilities in the Magnetospheric Plasma of Saturn

Details Waves and Instabilities in the Magnetospheric Plasma of Saturn Waves and Instabilities in the Magnetospheric Plasma of Saturn

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxac..40..295r&link_type=abstract

XIII Latin American Regional IAU Meeting (Eds. W. J. Henney & S. Torres-Peimbert) Revista Mexicana de Astronomía y Astrofísica (

Other

Planet-Disk Interactions, Planets And Satellites: Magnetic Fields, Planets And Satellites: Rings

Scientific paper

Ion Cyclotron Waves (ICW) and Mirror Mode Waves (MMW) have been observed by the Cassini spacecraft in Saturn's middle magnetosphere (Russell et al. 2006; Leisner et al. 2006). These waves have a common origin since they require plasma temperature anisotropy (pressure) to grow (T_{⊥}/T_{∥}≫ 1). ICW have frequencies close to the gyro-frequencies of water group ions (Ω_{W^+}), they are left-handed and in most regions propagate at small angles to the ambient magnetic field (B_o). 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 Wave (HMW) (Rodríguez-Martínez et al. 2010). On the other hand, MMW are very compressive modes characterized by strong dips in B_o which are anti-correlated with the density.

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