Evidence for Non‐Monotonic and Broadband Electron Distributions in the Europa Footprint Tail Revealed by Juno In Situ Measurements
Résumé
Moon-magnetospheres interaction result from the encounter between a magnetospheric plasma flow and moons, which act as obstacles to the plasma flow. In the Jovian magnetosphere, the Galilean moons orbit with a Keplerian velocity much slower than the plasma velocity, driven in near corotation by the planetary magnetic field. This means that in the reference frame of the moons, the plasma flows with a relative velocity ranging from 57 km s −1 for Io up to 192 km s −1 for Callisto (Saur, 2021). Therefore, they disturb the magnetospheric plasma flow, which in turn generates Alfvén waves in their close environments. These waves propagate along the bent magnetic field lines, forming the so-called Alfvén wings, accelerating particles, and triggering auroral emissions in the giant planet atmosphere. Thanks to decades of remote sensing, these moon-induced auroral emissions have been studied in various wavelengths, including infrared (
Domaines
Planète et Univers [physics]
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Geophysical Research Letters - 2023 - Rabia - Evidence for Non‐Monotonic and Broadband Electron Distributions in the Europa.pdf (4.58 Mo)
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