Jovian's plasma torus interaction with Europa. Plasma wake structure: 3D hybrid kinetic simulation and comparison with E4 flyby Galileo's observations

Details Jovian's plasma torus interaction with Europa. Plasma wake structure: 3D hybrid kinetic simulation and comparison with E4 flyby Galileo's observations Jovian's plasma torus interaction with Europa. Plasma wake structure: 3D hybrid kinetic simulation and comparison with E4 flyby Galileo's observations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11c1780l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11C-1780

Physics

[2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6218] Planetary Sciences: Solar System Objects / Jovian Satellites, [6285] Planetary Sciences: Solar System Objects / Trans-Neptunian Objects

Scientific paper

Abstract
The hybrid kinetic model supports comprehensive simulation of the interaction between different spatial and energetic elements of the Europa moon-magnetosphere system with respect to variable upstream magnetic field and flux or density distributions of plasma and energetic ions, electrons, and neutral atoms. This capability is critical for improving the interpretation of the existing Europa flyby measurements from Galileo orbital mission and for planning flyby and orbital measurements for future missions. The simulations are based on recent models of the atmosphere of Europa [1,2,3]. In contrast to previous approaches with MHD simulations, the hybrid model allows us to fully take into account the finite gyroradius effect and electron pressure, and to correctly estimate the ions velocity distribution and the fluxes along the magnetic field [4]. Photoionization, electron-impact ionization and charge exchange are included in our model. The temperature of the background electrons and pickup electrons was also included into the generalized Ohm's law. The background plasma contains O++, S++ thermal ions and energetic ions [5]. The pickup ions were created from the atmosphere. The majority of O2 atmosphere is thermal with an extended non-thermal population [1]. The moon is modeled in this initial work as a weakly conducting body. The first results of 3D hybrid kinetic simulation of Europa's environment in absence and with the induced magnetic dipole moment were presented in [4]. In this report we discuss the results of the hybrid kinetic simulation of Europa's environment and plasma wake for various temperatures of the atmospheric atom and we provide a comparison with observation data (E4 pass, [5]) and MHD simulations.

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