M. Herceg1, J. L. Jørgensen1, J. M.
G. Merayo1, T. Denver1, P. S.
Jørgensen1, M. Benn1, S.
Kotsiaros1, and J. E. P.
Connerney2,3
1Technical University of Denmark (DTU), Lyngby,
Denmark.
2Space Research Corporation, Annapolis, MD, United
States
3NASA Goddard Space Flight Center, Greenbelt, MD,
United States
Corresponding author: Matija Herceg
(mher@space.dtu.dk)
Key Points:
- The µASC observations confirms Ganymede’s magnetic lensing and
indicate its impact on the particle population and the wake region.
- Ganymede exhibits relative decrease (up to 52%) in high energy
particle flux which is central and symmetrical to the Ganymede
position.
- The magnetic shadow of Ganymede has a width of ~26,000
km, or ~10 Ganymede radii.
Abstract
The micro Advanced Stellar Compass (µASC), an attitude reference for the
Juno Magnetic Field investigation, also continuously monitors high
energy particle fluxes in Jupiter’s magnetosphere. The µASC camera head
unit (CHU) shielding is sufficient to stop electrons with energy
<15MeV. By recording the number of particles that penetrate
µASC CHU shielding and deposit energy in the CCD sensor, the µASC
functions as an energetic particle sensor with a detection threshold
well above that of the Juno Energetic Particle Detector Instrument
(JEDI) flown for that purpose. Radiation data gathered by the µASC is
used to monitor the radiation environment of Jupiter and mapping of the
trapped high energy particles. Comparison of the particle population
around Jupiter with individual perijove particle observations reveals
disturbances when Juno is traversing Ganymede’s M-shell. We present
highly energetic electrons interaction with Ganymede’s magnetic field,
magnitude and extend of the particle depletion associated with the
Ganymede interaction.