PIA00319: Global Mercator Mosaic

Target Name: Io Is a satellite of: Jupiter Mission: Voyager Spacecraft: Voyager 1 Product Size: 2468 samples x 1051 lines Produced By: U.S. Geological Survey Addition Date: 1998-06-04 Primary Data Set: Voyager EDRs Full-Res TIFF: PIA00319.tif (8.191 MB) Full-Res JPEG: PIA00319.jpg (209.7 kB)

Original Caption Released with Image: Io's volcanic plains are shown in this Voyager 1 image mosaic which covers the area roughly from latitude 60 degrees N. to latitude 60 degrees S. and longitude 100-345. North is up. Numerous volcanic calderas, lava flows, and volcanic eruption plumes are visible here. The composition of Io's volcanic plains and lava flows has not been determined, but they could consist dominantly of sulfur with surface frosts of sulfur dioxide or of silicates (such as basalt) encrusted with sulfur and sulfur dioxide condensates. The bright whitish patches probably consist of freshly deposited sulfur dioxide frost. Image Credit: NASA/JPL/USGS