Abstract
The Juno Waves instrument measured plasma waves associated with
Ganymede’s magnetosphere during its flyby on 7 June, day 158, 2021.
Three distinct regions were identified including a wake, and nightside
and dayside regions in the magnetosphere distinguished by their electron
densities and associated variability. The magnetosphere includes
electron cyclotron harmonic emissions including a band at the upper
hybrid frequency, as well as whistler-mode chorus and hiss. These waves
likely interact with energetic electrons in Ganymede’s magnetosphere by
pitch angle scattering and/or accelerating the electrons. The wake is
accentuated by low-frequency turbulence and electrostatic solitary
waves. Radio emissions observed before and after the flyby likely have
their source in Ganymede’s magnetosphere.