Energetic neutral atoms could map Uranus's magnetic field

Scientists are exploring new ways to study Uranus's mysterious magnetic environment, and a recent study suggests that energetic neutral atoms (ENAs) could play a key role. ENAs are formed when charged ions collide with neutral particles, stealing an electron and becoming neutral themselves. These particles travel in straight lines, making them detectable by spacecraft instruments.

The research, led by Santos-Costa and Andre, used realistic data about Uranus, including its unusual magnetic field and surrounding neutral particles, to simulate how ENAs might behave. The simulations showed that a detector similar to the one on the Cassini mission to Saturn could detect ENAs around Uranus, even in less favorable conditions.

The study focused on collisions between protons and neutral particles, both from Uranus itself and its moons. While the results indicate that ENAs from the planet are likely detectable, the team found that signals from the moons remain uncertain. The simulations also suggest that ENA imaging could help map Uranus's magnetosphere and atmospheric escape regions.

The researchers argue that including ENA imaging in future missions to Uranus could provide critical insights into the planet's magnetic system. Their findings, published in the Journal of Geophysical Research: Space Physics, highlight the potential of this technique for deepening our understanding of the ice giant.