PIA00327: Io, the South Polar Region
 Target Name:  Io
 Is a satellite of:  Jupiter
 Mission:  Voyager
 Spacecraft:  Voyager 1
 Instrument:  Imaging Science Subsystem 
 Product Size:  2175 x 2810 pixels (w x h)
 Produced By:  U.S. Geological Survey
 Addition Date:  1998-06-04
 Primary Data Set:  Voyager EDRs
 Full-Res TIFF:  PIA00327.tif (8.014 MB)
 Full-Res JPEG:  PIA00327.jpg (297.8 kB)

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Original Caption Released with Image:

This Voyager 1 image mosaic shows Io's south polar region. The South Pole is near the terminator (line between daylight and night) at right center. Haemus Mons, a 10-km high (32,000 foot) mountain is at bottom. Elsewhere, much flatter volcanic plains, eroded volcanic plateaus, and crater-like volcanic calderas dominate the scene. The partly black-filled caldera at far left is Creidne Patera. The composition of the prevalent volcanic plains of Io could consist dominantly of sulfur with a thin discontinuous coating of sulfur dioxide frost or of silicates (such as basalt) coated with sulfurous condensates. The black material in Creidne Patera is where sulfur or silicates are probably still molten, whereas the brown material in the caldera is probably where the sulfur has solidified.

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