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

   
                               NIMS Image of Io
                                       
   
   
   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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   The Near Infrared Mapping Spectrometer (NIMS) on the Galileo
   spacecraft imaged Io at high spectral resolution at a range of 439,000
   km (275,000 miles) during the G2 encounter on 6 September 1996. This
   image shows, on the right, Io as seen by NIMS, centered on 220 W
   longitude. The image on the left shows the same view point from
   Voyager data (from the encounters in 1979 and 1980). The NIMS image
   can be compared to the NIMS hotspot image from the G1 orbit (June
   1996) to monitor changes on Io. The most dramatic feature of the G2
   image is the hotspot at Malik Patera. Preliminary analysis of the data
   yields a temperature of at least 1000 K (727 C) for this hotspot, an
   increase of more than 300 K from the G1 encounter. In the overlap area
   of the G1 and G2 images all the hotspots seen during the G1 encounter
   are also seen in the G2 image. Other hotspots were seen, including one
   at the Pele plume origin site. This image is at the 4 micron band to
   best view the Malik hotspot. Most of the other hotspots are best seen
   at longer wavelengths. NIMS is continuing to observe Io to monitor
   volcanic activity throughout the Galileo mission.
   
   
   
   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.