Ganymede MHD Model: Magnetospheric Context for Juno’s PJ34 Flyby | CU Experts

On June 7th, 2021 the Juno spacecraft visited Ganymede and provided the; first in situ observations since Galileo’s last flyby in 2000. The; measurements obtained along a one-dimensional trajectory can be brought; into global context with the help of three-dimensional magnetospheric; models. Here we apply the magnetohydrodynamic model of; citeA{Duling2014} to conditions during the Juno flyby.; In addition to the global distribution of plasma variables we provide; mapping of Juno’s position along magnetic field lines, Juno’s distance; from closed field lines and detailed information about the magnetic; field’s topology such as the boundary between open and closed field; lines on Ganymede’s surface. To estimate the sensitivity of the model; results, we carry out a parameter study with different upstream plasma; conditions and other model parameters. Utilizing auroral observations by; Juno our model indicates that Juno did not enter the closed field line; region unless the plasma pressure was exceptionally low.

Duling S; Saur J; Clark G; Allegrini F; Greathouse TK; Gladstone R; Kurth WS; Connerney JEP; Bagenal F; Sulaiman AH

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