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@article{Kaweeyanun:2024:10.1016/j.icarus.2024.116356,
author = {Kaweeyanun, N and Masters, A},
doi = {10.1016/j.icarus.2024.116356},
journal = {Icarus},
title = {Three-dimensional modelling of Ganymede’s Chapman–Ferraro magnetic field and its role in subsurface ocean induction},
url = {http://dx.doi.org/10.1016/j.icarus.2024.116356},
year = {2024}
}
TY - JOUR
AB - In April 2023, the JUpiter ICy moon Explorer (JUICE) began its journey to orbit Jupiter’s largestand only magnetic moon, Ganymede. Part of the mission’s objectives aim to verify existence ofthe moon’s subsurface ocean and determine its structure through its induced response to externalexcitation by periodically varying magnetic field. Known contributions to the excitation are thosefrom Jupiter’s dipole (at synodic period) and quadrupole (at half-synodic period) variations,and Ganymede’s inclined eccentric orbit around Jupiter (at orbital period). We propose thatGanymede’s magnetopause, where the Chapman-Ferraro (C-F) magnetic field arises from localcurrents, also contributes to subsurface ocean induction. This article introduces the first three-dimensional model of the C-F field and its outputs at Ganymede’s subsurface ocean and largermagnetosphere. The field is shown to be non-uniform - strongest near upstream Ganymede’s subflow region and gradually weakening away from it. Magnetopause asymmetry due to the Jovianguide field results in largely synodic variation of the C-F field, with exceptions near Ganymede’sequator and subflow meridian where asymmetry effects are minimal and the variations are half-synodic. The C-F field amplitude is of general order 50 nT, which is significant relativeto excitation from the Jovian field. Comparisons to Galileo data and magnetohydrodynamicsimulation results suggest the model is useful, therefore the magnetopause effects must beconsidered in future induction modelling of Ganymede’s subsurface ocean ahead of the JUICEmission.
AU - Kaweeyanun,N
AU - Masters,A
DO - 10.1016/j.icarus.2024.116356
PY - 2024///
SN - 0019-1035
TI - Three-dimensional modelling of Ganymede’s Chapman–Ferraro magnetic field and its role in subsurface ocean induction
T2 - Icarus
UR - http://dx.doi.org/10.1016/j.icarus.2024.116356
UR - http://hdl.handle.net/10044/1/115499
ER -