Is the Jovian inner magnetosphere interchange unstable?

The Jovian inner magnetosphere extends to about 20-30 times the radius of Jupiter (RJ) and is heavily influenced by Jupiter's internal magnetic field, particularly near the equator where it is predominantly directed southward. Unlike Earth's inner magnetosphere, which is mainly driven by energetic particle drift motions and ionosphere interactions, Jupiter's inner magnetosphere presents unique challenges due to its large size, rapid rotation, moon-sourced plasma and non-thermal populations. Centrifugal forces play a significant role in structuring the Jovian inner magnetosphere through interchange instability, affecting the transport of mass, momentum, energy, and particle energization. However, the stability of the Jovian inner magnetosphere remains uncertain. Limited global measurements have hindered a comprehensive understanding of Jupiter's inner magnetosphere. In this presentation, the latest high-resolution global and regional simulations of the Jovian magnetosphere will be discussed, focusing on the stability of the fast-rotating inner magnetosphere and incorporating derivations from extended magnetohydrodynamic theories. These simulations, combined with theoretical calculations based on in-situ measurements, suggest that the Jovian inner magnetosphere is likely interchange unstable, although uncertainties in the properties of the hot plasma population complicate the analysis.