From http://www.jpl.nasa.gov/galileo/


            Changes East of Pele Between Galileo's First Two Orbits
                                       
   
   
   NOTE: This image is made available in order to share with the public
   the excitement of new discoveries being made via the NASA/JPL Galileo
   spacecraft. Galileo scientists are in the process of calibrating and
   validating this data. The full digital image necessary for scientific
   analysis will be released within one year of receipt of this orbit's
   last data.
   
   This image is available only on the WWW; it is not available in
   hardcopy or other forms.
   
   
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Changes East of Pele Between Galileo's First Two Orbits

   Detail of changes east of Pele on Jupiter's moon Io as seen by NASA's
   Galileo spacecraft between June (left) and September (right) 1996. The
   caldera at the center of the images that changes from bright to dark
   is approximately 80 kilometers in diameter. Some scientists speculate
   that this brightness (albedo) change might be due to flooding of the
   crater floor by lava. The left frame was reprojected and stretched to
   match the geometry and average colors of the right frame. Before this
   stretch, the earlier image (left) was significantly redder than the
   later image (right); this may be due to variations in lighting. Both
   frames were created with images from the Galileo Solid State Imaging
   system's near- infrared (756 nm), green, and violet filters. North is
   to the top of both frames.
   
   Launched in October 1989, Galileo entered orbit around Jupiter on
   December 7, 1995. The spacecraft's mission is to conduct detailed
   studies of the giant planet, its largest moons and the Jovian magnetic
   environment. The Jet Propulsion Laboratory, Pasadena, CA manages the
   mission for NASA's Office of Space Science, Washington, DC.
   
   
   
   This image and other images and data received from Galileo are posted
   on the World Wide Web, on the Galileo mission home page at URL
   http://www.jpl.nasa.gov/galileo. Background information and
   educational context for the images can be found at URL
   http://www.jpl.nasa.gov/galileo/sepo.