Observations from various missions to Jupiter and Saturn showed that temperature of heavy-ion plasma contained in expanding discs around planets is increasing with radial distance. Magnetospheres of Jovian planets are successfully heating ions in a plasma fluid and magnetic field system. Turbulent fluctuations were suggested as a plasma heating mechanism. Suitability of turbulence to heat heavy-ion dense plasma and the source of turbulent fluctuations in Jupiter's magnetosphere is investigated. Relation between ion velocity variations and magnetic field fluctuations is derived from magnetohydrodynamic principles. This is then used to obtain turbulent power density contained in plasma fluid and magnetic field. Energy cascade in magnetohydrodynamic and kinetic subranges in different mediums is demonstrated. Measurements from magnetometer instrument on Juno mission to Jupiter are used to observe turbulent fluctuations in the magnetic field and to infer dynamics in plasma fluid. Extensive radial map of turbulent power density in Jupiter's magnetosphere inside and outside of the plasma disk is presented.

• Received 24 August 2023
• Accepted 18 January 2024

DOI:https://doi.org/10.1103/PhysRevFluids.9.024602