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

   
                 Changes on Io's Loki-Pele hemisphere (color)
                                       
   
   
   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's Loki-Pele hemisphere (color)

   
   
   This color composite of Io was acquired by Galileo during its sixth
   orbit (E6) of Jupiter as part of a sequence of images designed to
   monitor changes in the surface color due to volcanic activity. Two
   prominent features in this hemisphere are Pele (the big red ring) and
   Loki (the dark horseshoe shaped feature). Amaterasu Patera, the dark
   spot north of Loki, has darkened since G1. The new deposits at Ra
   Patera (below Loki) have faded in appearance since the images taken
   eight months earlier during Galileo's first orbit (G1). (Compare this
   view of Ra Patera with the Galileo images from June 1996 and Voyager
   images obtained in 1979. A limb view showing the erupting plume during
   G1 is available as well.)
   
   North is to the top of the picture which combines images acquired
   using violet, green, and near-infrared (756 micrometers) filters. The
   resolution is 11.2 kilometers per picture element. The images were
   taken on February 20, 1997 at a range of 554,000 kilometers by the
   solid state imaging (CCD) system on NASA's Galileo spacecraft.
   
   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.