This animation of Io is a sequence of 9 images taken by the Voyager 2 on the evening of July 9, 1979, from a range of 1.2 million kilometers (745,700 miles). On the limb of Io are two volcanic plumes about 100 kilometers (62 miles) high. These two plumes were first seen by Voyager 1 in March 1979. They apparently had been erupting for a period of at least four months and probably longer. A total of six plumes were seen by Voyager 2, all of which were first seen by Voyager 1.
This image is Copyright © 2003 by Calvin J. Hamilton. Any commercial/for-profit use of this image needs to be addressed to Calvin J. Hamilton.