MHD Model of Ganymede's Magnetosphere: Predicted magnetic field on Juno's trajectory

  • Stefan Duling (Creator)
  • Joachim Saur (Creator)
  • George Clark (Creator)
  • Frederic Allegrini (Creator)
  • Thomas Greathouse (Creator)
  • Randy Gladstone (Creator)
  • William Kurth (Creator)
  • John E. P. Connerney (Creator)
  • Fran Bagenal (Creator)
  • Ali H Sulaiman (Creator)



This dataset contains model results from a magnetohydrodynamic (MHD) model of Ganymede's magnetosphere adapted to Juno's PJ34 flyby in 2021. Here we publish predicted magnetic field components on Juno's trajectory that can be compared to MAG measurements and are displayed in Figure 3 of Duling et al. (2022). Each file contains data from one model. The dataset includes all models with parameter variations from Duling et al. (2022). These are summarized in Table 1 of Duling et al. (2022) and displayed in Figure 3 with the gray lines. If not varied, all models are run with the following parameters: Upstream Jovian background magnetic field B0 = (−15,24,−75) nT Upstream plasma velocity v0 = 140 km/s Upstream plasma mass density \(\rho\)0 = 100 amu/cm3 Upstream plasma thermal pressure p0 = 2.8 nPa Ionization frequency \(\nu_{ion}\) = 2.2e8/s Atmospheric surface mass density \(n_{n,0}\) = 8e6/cm3 Dipole Gauss coefficient \(g_1^0\) = −716.8 nT The published data files correspond to the following models with each one parameter variation: Parameter Value Filename Suffix default model - default Upstream Jovian background magnetic field (measured before flyby) B0 = (−16,3,−70) nT B0before Upstream Jovian background magnetic field (measured after flyby) B0 = (−14,43,−80) nT B0after Upstream plasma velocity (min) v0 = 120 km/s v- Upstream plasma velocity (max) v0 = 160 km/s v+ Upstream plasma mass density (min) \(\rho\)0 = 10 amu/cm3 rho- Upstream plasma mass density (max) \(\rho\)0 = 160 amu/cm3 rho+ Upstream plasma thermal pressure (min) p0 = 1.0 nPa p- Upstream plasma thermal pressure (max) p0 = 5.0 nPa p+ Ionization frequency (min) \(\nu_{ion}\) = 0.5e8/s prod- Ionization frequency (max) \(\nu_{ion}\) = 10.0e8/s prod+ Atmospheric surface mass density (min) \(n_{n,0}\) = 1.6e6/cm3 nn- Atmospheric surface mass density (max) \(n_{n,0}\) = 40e6/cm3 nn+ Dipole Gauss coefficient (min) \(g_1^0\) = −702.5 nT dipole- Dipole Gauss coefficient (max) \(g_1^0\) = −731.1 nT dipole+ Magnetic Field components and Juno's position are in GPhiO system. GPhiO is defined by the primary direction z parallel to Jupiter’s rotation axis, the secondary direction y is pointing from Ganymede's towards Jupiter's barycenter and x completes the right-handed system approximately in direction of plasma flow. Columns: Spacecraft time [UTC] Bx modeled magnetic field in GPhiO [nT] By modeled magnetic field in GPhiO [nT] Bz modeled magnetic field in GPhiO [nT] B modeled magnetic field magnitude [nT] x of Juno in GPhiO [km] y of Juno in GPhiO [km] z of Juno in GPhiO [km]
Date made available2023

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