Juno Plasma Wave Observations at Ganymede.
Kurth, W.S.; Sulaiman, A.H.; Hospodarsky, G.B.; Menietti, J.D.; Mauk, B.H.; Clark, G.; Allegrini, F.; Valek, P.; Connerney, J.E.P.; Waite, J.H.; Bolton, S.J.; Imai, M.; Santolik, O.; Li, Wen; Duling, S.; Saur, J.; Louis, C.
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.
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