Survey of Anisotropic Electron Moments in Saturn's Magnetosphere

Details Survey of Anisotropic Electron Moments in Saturn's Magnetosphere Survey of Anisotropic Electron Moments in Saturn's Magnetosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11a1987a&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM11A-1987

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2756] Magnetospheric Physics / Planetary Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

The standard approach used to estimate the electron density and temperature of electrons in Saturn's magnetosphere from the Cassini Plasma Spectrometer Electron Spectrometer is to numerically integrate the observed fluxes from a single anode assuming the distribution is isotropic in the spacecraft frame (Lewis et al., 2008; Arridge et al., 2009). In this paper we remove the isotropic assumption and integrate fluxes organised by pitch angle to produce anisotropic moments, assuming the distribution function is gyrotropic in the spacecraft frame. Missing segments of the distribution function are filled using a number of different strategies. There are numerous science drivers for such a study, for example to understand plasma transport, facilitate diffusive equilibrium calculations and understand pressure anisotropies in the ring current. In this poster we present our method for calculating n, T|| and T⊥ and discuss the limitations in our technique, paying particular attention to the validity of the isotropic assumption made by Rymer (2004), Lewis et al. (2008), Schippers et al. (2008), Arridge et al. (2009), and others. We then present a survey of our moments and compare these with calculated ion moments (Thomsen et al., 2010).

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