MHD Model of Ganymede's Magnetosphere: Predicted magnetic field on Juno's trajectory
Creators
- 1. Institute of Geophysics and Meteorology, University of Cologne, Cologne, Germany
- 2. The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
- 3. Southwest Research Institute, San Antonio, Texas, USA
- 4. Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, USA
- 5. NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- 6. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado, USA
- 7. School of Physics and Astronomy, Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, Minnesota, USA
Description
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 \(\nu_{ion}\) = 2.2e-8/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) | \(\nu_{ion}\) = 0.5e-8/s | prod- |
| Ionization frequency (max) | \(\nu_{ion}\) = 10.0e-8/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]
Files
Duling2022_JunoGanymede_modeled_magnetic_field_B0after.txt
Files
(1.7 MB)
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Additional details
Related works
- Is supplement to
- Journal article: 10.1029/2022GL101688 (DOI)
- Is supplemented by
- Dataset: 10.5281/zenodo.7105334 (DOI)
- Dataset: 10.5281/zenodo.7096938 (DOI)