The resolution is 21 kilometers per picture element. Obtaining images at such illuminations is like taking a picture from a high altitude around sunrise or sunset. Such lighting conditions emphasize the topography of the volcanic satellite. Several mountains up to a few miles high can be seen in this view, especially near the upper right. Some of these mountains appear to be tilted crustal blocks.
North is to the top of the picture.
The resolution is 8.3 kilometers per picture element. Volcanic plumes on Io T his color image, acquired during Galileo's ninth orbit around Jupiter, shows two volcanic plumes on Io. The vent is near the center of the bright and dark rings. Plumes on Io have a blue color, so the plume shadow is reddish. The Prometheus plume can be seen in every Galileo image with the appropriate geometry, as well as every such Voyager image acquired in 1979.