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Record 1 of 2772
Jovian Plasma Torus Interaction with Europa: 3D Hybrid Kinetic Simulation. First results
External Online Source: doi:10.1016/j.pss.2010.06.015
Author and Affiliation:
Lipatov, A. S.(Moscow Inst. of Physics and Technology, Dept. of Problems of Physics and Energetics, Moscow, Russian Federation)
Cooper, J. F.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Paterson, W. R.(Hampton Univ., VA, United States)
Sittler, E. C.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Hartle, R. E.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Simpson, D. G.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
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 the Galileo orbiter mission, and for planning flyby and orbital measurements, (including the surface and atmospheric compositions) for future missions. The simulations are based on recent models of the atmosphere of Europa (Cassidy etal.,2007;Shematovichetal.,2005). In contrast to previous approaches with MHD simulations, the hybrid model allows us to fully take into account the finite gyro radius effect and electron pressure, and to correctly estimate the ion velocity distribution and the fluxes along the magnetic field (assuming an initial Maxwellian velocity distribution for upstream background ions).Non-thermal distributions of upstream plasma will be addressed in future work. Photoionization,electron-impact ionization, charge exchange and collisions between the ions and neutrals are also included in our model. We consider two models for background plasma:(a) with O(++) ions; (b) with O(++) and S(++) ions. The majority of O2 atmosphere is thermal with an extended cold population (Cassidyetal.,2007). A few first simulations already include an induced magnetic dipole; however, several important effects of induced magnetic fields arising from oceanic shell conductivity will be addressed in later work.
Publication Date: Jun 20, 2010
Document ID:
20110013513
(Acquired Jul 22, 2011)
Subject Category: GEOPHYSICS
Report/Patent Number: GSFC.JA.4563.2011
Document Type: Journal Article
Publication Information: Planetary and Space Science; Volume 58; 1681-1691
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 11p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ATMOSPHERIC MODELS; COMPUTERIZED SIMULATION; EUROPA; FLYBY MISSIONS; ION DISTRIBUTION; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; TOROIDAL PLASMAS; MAXWELL-BOLTZMANN DENSITY FUNCTION; NEUTRAL ATOMS; RADII; VELOCITY DISTRIBUTION; UPSTREAM
Miscellaneous Notes: Partial support from the Projects/Grants 00004129 and 0004549 between the GEST Center UMBC and NASA GSFC
Availability Source: Other Sources
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