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

   
                     Changes on Io around Maui and Amirani
                                       
   
   
   NOTE: This JPEG 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 on Io around Maui and Amirani between Voyager 1 and Galileo's second
orbit

   Detail of changes on Jupiter's moon Io in the region around Maui and
   Amirani as seen by the Voyager 1 spacecraft in April 1979 (left frame)
   and NASA's Galileo spacecraft in September 1996 (right frame). North
   is to the top of both frames. The dark, north - south running linear
   feature, Amirani, is approximately 350 km long. Maui is the large
   circular feature immediately west of the southern end of Amirani. Note
   the brightening of the west side of Maui and the bright patch on the
   west side of Amirani.
   
   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.