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Embedded Kinetic Simulation of Ganymede's Magnetosphere: Improvements and Inferences
Author(s) -
Zhou Hongyang,
Tóth Gábor,
Jia Xianzhe,
Chen Yuxi,
Markidis Stefano
Publication year - 2019
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja026643
Subject(s) - magnetosphere , physics , magnetohydrodynamic drive , magnetopause , plasma , geophysics , magnetohydrodynamics , galileo (satellite navigation) , magnetic field , computational physics , magnetosphere of saturn , jovian , icy moon , astrobiology , planet , saturn , geology , astrophysics , geodesy , quantum mechanics
The largest moon in the solar system, Ganymede, is also the only moon known to possess a strong intrinsic magnetic field and a corresponding magnetosphere. Using the new version of Hall magnetohydrodynamic with embedded particle‐in‐cell model with a self‐consistently coupled resistive body representing the electrical properties of the moon's interior, improved inner boundary conditions, and the flexibility of coupling different grid geometries, we achieve better match of magnetic field with measurements for all six Galileo flybys. The G2 flyby comparisons of plasma bulk flow velocities with the Galileo Plasma Subsystem data support the oxygen ion assumption inside Ganymede's magnetosphere. Crescent shape, nongyrotropic, and nonisotropic ion distributions are identified from the coupled model. Furthermore, we have derived the energy fluxes associated with the upstream magnetopause reconnection of ∼10 −7 W/cm 2 based on our model results and found a maximum of 40% contribution to the total peak auroral emissions.