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Updated spherical harmonic moments of Ganymede from the Juno flyby

Weber, Tristan and Moore, Kimberly and Connerney, John and Espley, Jared and DiBraccio, Gina and Romanelli, Norberto (2022) Updated spherical harmonic moments of Ganymede from the Juno flyby. . (Unpublished)

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In this study, we use data from the Juno and Galileo spacecraft to analyze the internal magnetic dynamo of Ganymede. As the only known moon with a strong internal magnetic field, Ganymede is a uniquely interesting object in the context of understanding the formation and structure of planetary magnetospheres. Using a spherical harmonic model centered on the moon, we report a dipole approximation for Ganymede of g₀¹ = -716.4 nT, g₁¹ = 56.0 nT, and h₁¹ = 27.0 nT. We find that using a quadrupole fit rather than a dipole fit provides only a marginal increase in accuracy, and instead favor the use of a dipole approximation until more data can be obtained. The magnetic moment estimates provided here can be used as a baseline for interpreting data from future spacecraft flybys of the moon, and can serve as inputs into numerical models studying Ganymede's magnetosphere.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper ItemGalileo data ItemJuno data
Weber, Tristan0000-0002-2116-6558
Moore, Kimberly0000-0003-3162-437X
Connerney, John0000-0001-7478-6462
Espley, Jared0000-0002-6371-9683
DiBraccio, Gina0000-0002-2778-4998
Romanelli, Norberto0000-0001-9210-0284
Additional Information:This material is based upon work supported by NASA under award number 80GSFC21M0002. KMM is supported by the 51 Pegasi b Fellowship though the Heising-Simons Foundation. All data used in this study can be found on the planetary plasma interactions on the planetary data system. The Galileo data can be found at The Juno data can be found at
Funding AgencyGrant Number
Heising-Simons Foundation51 Pegasi b Fellowship
Record Number:CaltechAUTHORS:20220310-121129000
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113867
Deposited By: George Porter
Deposited On:11 Mar 2022 20:53
Last Modified:11 Mar 2022 20:53

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