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 Duling et al.; (2014) 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. We find that; Juno did not enter the closed field line region and that the boundary; between open and closed field lines on the surface matches the poleward; edges of the observed auroral ovals. To estimate the sensitivity of the; model results, we carry out a parameter study with different upstream; plasma conditions and other model parameters.

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

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