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Published September 22, 2022 | Version v1
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MHD model output for Ganymede's magnetosphere during Juno's flyby

  • 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


This dataset contains the complete simulation output from our MHD model of Ganymede's magnetosphere adapted to Juno's PJ34 flyby in 2021 (Duling et al. 2022).

The data was obtained by our application of the PLUTO simulation code v4.4 (Mignone et al. 2007) ( described in Duling et al. 2022.

The dataset includes the simulation variables on the simulation grid for a single timestep after steady state was reached. The grid has spherical geometry (r, theta, phi) with phi=0° longitude pointing towards Jupiter (positive y axis of the GPhiO system), phi=90° longitude pointing in the upstream direction (negative x axis of GPhiO) and theta=0° latitude at Ganymede's north pole (positive z axis of GPhiO). The following model variables are included:

rho: plasma mass density
prs: thermal plasma pressure
vx1: plasma velocity radial component
vx2: plasma velocity theta component
vx3: plasma velocity phi component
Bx1: magnetic field radial component
Bx2: magnetic field theta component
Bx3: magnetic field phi component

Additionally the following derived variables are included:

Jx1: electric current density radial component
Jx2: electric current density theta component
Jx3: electric current density phi component
Bpx1: plasma magnetic field radial component
Bpx2: plasma magnetic field theta component
Bpx3: plasma magnetic field phi component

Plasma magnetic field means that part of the total magnetic field that results from the plasma interaction. It equals the total magnetic field subtracted by the homogeneous upstream field and Ganymede's intrinsic and induced field.

All values are in normalized units with these normalization factors:

NORMR = 2.631e8  cm
NORMV = 1.4e7  cm/s
NORMRHO = 1.661e-22  g/cm^3
NORMPRS = 3.255e-08  dyne/cm^2
NORMB = 6.395e-04  Gauss
NORMJ = 5.801e-03  statA/cm^2

In Duling et al. 2022 we present results of a model sensitivity study. This dataset includes model output from our best guess setup (default setup) only.

Since the data is in PLUTO's binary format "flt" we provide a Python code snippet that reads the data to data arrays.

This ASCII file contains the grid dimensions and coordinates of the cell boundaries.

This binary file contains the simulation variables on the cell centers of the grid.

This ASCII file contains the header of the PLUTO logfile.
This Python code snippet helps with reading the data.


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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.7628719 (DOI)


Exo-Oceans – Searching and Characterizing Extraterrestrial Subsurface Oceans 884711
European Commission


  • Mignone, A., Bodo, G., Massaglia, S., Matsakos, T., Tesileanu, O., Zanni, C., & Ferrari, A. (2007). PLUTO: A numerical code for computational astro- physics. The Astrophysical Journal Supplement Series, 170 (1), 228–242. doi: 10.1086/513316