Juno arrived at Jupiter in 2016 and the mission is expected to end until summer 2021.

Here's an amazingly clear pic of Io given volatile atmospheric conditions, captured during a solar eclipse on 21Dec2018. At the time Io was close to Jupiter and well-lighted by another Jovian moon, Europa.

Io is the most volcanically active place in the solar system, and many volcanoes are visible here, including the plume of an active volcano.