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NASA's Juno Discovers Auroras on Jupiter's Callisto Moon

9/8/2025

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Summary

Story summary

NASA's Juno spacecraft detected auroras on Jupiter's moon Callisto, completing the auroral signatures of all four Galilean moons.
This discovery improves understanding of Jupiter's magnetosphere interactions with its moons.
Callisto's auroral signature was challenging to detect due to its faintness and proximity to Jupiter's brighter auroras.
The breakthrough occurred during Juno's 22nd orbit in September 2019, following a solar wind event.
Future missions, including NASA's Europa Clipper and ESA's JUICE, will further investigate these dynamics.

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Story summary

NASA's Juno spacecraft detected auroras on Jupiter's moon Callisto, completing the auroral signatures of all four Galilean moons.
This discovery improves understanding of Jupiter's magnetosphere interactions with its moons.
Callisto's auroral signature was challenging to detect due to its faintness and proximity to Jupiter's brighter auroras.
The breakthrough occurred during Juno's 22nd orbit in September 2019, following a solar wind event.
Future missions, including NASA's Europa Clipper and ESA's JUICE, will further investigate these dynamics.