Electron Physics in 3‐D Two‐Fluid 10‐Moment Modeling of Ganymede's Magnetosphere

Wang, Liang; Germaschewski, Kai; Hakim, Ammar; Dong, Chuanfei; Raeder, Joachim; Bhattacharjee, Amitava

doi:10.1002/2017JA024761

Title: Electron Physics in 3‐D Two‐Fluid 10‐Moment Modeling of Ganymede's Magnetosphere

Journal Article · Sat Apr 21 00:00:00 EDT 2018 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2017JA024761· OSTI ID:1434200

^[1];

^[1]; Hakim, Ammar ^[2];

^[3];

^[1]; Bhattacharjee, Amitava ^[3]

Space Science Center University of New Hampshire Durham NH USA
Princeton Center for Heliophysics, Princeton Plasma Physics Laboratory Princeton University Princeton NJ USA
Princeton Center for Heliophysics, Princeton Plasma Physics Laboratory Princeton University Princeton NJ USA, Department of Astrophysical Sciences Princeton University Princeton NJ USA

Abstract We studied the role of electron physics in 3‐D two‐fluid 10‐moment simulation of Ganymede's magnetosphere. The model captures nonideal physics like the Hall effect, electron inertia, and anisotropic, nongyrotropic pressure effects. A series of analyses were carried out: (1) The resulting magnetic field topology and electron and ion convection patterns were investigated. The magnetic fields were shown to agree reasonably well with in situ measurements by the Galileo satellite. (2) The physics of collisionless magnetic reconnection were carefully examined in terms of the current sheet formation and decomposition of generalized Ohm's law. The importance of pressure anisotropy and nongyrotropy in supporting the reconnection electric field is confirmed. (3) We compared surface “brightness” morphology, represented by surface electron and ion pressure contours, with oxygen emission observed by the Hubble Space Telescope. The correlation between the observed emission morphology and spatial variability in electron/ion pressure was demonstrated. Potential extension to multi‐ion species in the context of Ganymede and other magnetospheric systems is also discussed.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DESC0006670

OSTI ID:: 1434200

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Vol. 123 Journal Issue: 4; ISSN 2169-9380

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 33 works

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