Click on any picture to get a larger image of that picture.
Picture by the Galileo spacecraft of active volcanic plumes on Io. The inset picture at the top right shows an eruption of Pillan Patera. This plume is about 140 kilometers high.
The inset picture at the lower right-hand side shows a plume from Prometheus.
It might be that the Prometheus plume has been continuously active for more than 20 years. (Is is visible as an active plume on all the Voyager images of 1979, on the Hubble Space Telescope images and all the Galileo spacecraft images.)
Pictures of volcanic plumes on Jupiter's moon Io by the Galileo spacecraft. The pictures at the bottom row enlarge the pictures above them.
These plumes of gas and dust come from Io's active volcanoes: Zamama and Prometheus.
The first 2 pictures show the plumes best - from the side. The last 2 pictures shows the plumes from overhead. These plumes are about 100 kilometers high.
The color in these photographs have been enhanced to make the plumes easier to see.
Three infrared pictures of the volcanoes on Jupiter's moon Io by NASA's Galileo spacecraft.
Picture 1 - October 1999, picture 2 - November 1999, picture 3 - February 2000.
The currently active volcanoes are the bright yellow spots.
The Prometheus volcano is the smaller yellow spot near the middle (slightly towards the right) of all three these pictures.
Before these photos, only Prometheus and three other volcanoes were known to be active in this region.
Using these and other photographs, scientists detected 14 volcanoes in this area overall. Careful study of these fainter volcanoes show changes in activity over these 5 months.
The first map of temperatures over large areas of Io's night-side. The photopolarimeter-radiometer on NASA's Galileo spacecraft provided the data for this map during 1999 and 2000. The temperature contours are in degrees Kelvin (K).
Several volcanic hot spots are visible: Loki (L); Amaterasu (A); Daedalus (D); Pillan (P); Pele (Pe); Marduk (M), Babbar (B) and Lei-Kung.
