Jupiter's auroras

Jupiter

. High-energy electrons and ions cascade into Jupiter's upper atmosphere and create bright auroras at ultraviolet wavelengths. This composite image, taken by the Hubble Space Telescope in September 1997, shows ovals in both the northern and southern regions. Elongated trails outside the ovals, starting from the far left below the ovals and moving to the right, are believed to mark the locations where powerful electrical currents from the volcanic moon Io enter the Jovian atmosphere. (Courtesy of John Clarke, University of Michigan, the Space Telescope Science Institute, and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University