Ganymede MHD Model: Magnetospheric Context for Juno's PJ34 Flyby by Stefan Duling et al. on Monday 28 November

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.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.14092v1