Injection and loss mechanisms for energetic ions in the inner Jovian magnetosphere

Physics

Scientific paper

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Energetic Particles, Io, Ion Distribution, Ion Injection, Magnetospheric Ion Density, Planetary Magnetospheres, Satellite Atmospheres, Ion Production Rates, Ionic Diffusion, Ionic Mobility, Jupiter (Planet), Protons

Scientific paper

It is noted that the pronounced depletion of energetic ions observed by Voyager outside the orbit of Io can be understood as a steady-state balance between particle loss and inward diffusion. For ions exceeding 1 MeV/nucleon G sweeping loss by Io itself is unimportant; rather the removal mechanisms involve processes that are associated with the extensive torus of neutral and ionized gas emanating from the satellite. Compelling evidence exists to suggest that losses throughout an extended region in the outer torus, exterior to the orbit of Io, occur at a rate comparable to the upper limit imposed by strong pitch angle diffusion, even though the plasma waves responsible for such scattering have yet to be detected. This is by far the predominant process for removing energy from the inner Jovian magnetosphere, and it also furnishes a viable energy source for exciting intense Jovian auroral emisions.

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