PIA01094: Io Degassing from sub- and anti-Jupiter Regions

Io Degassing from sub- and anti-Jupiter Regions


Shown here are color-coded images of Io in eclipse (top). The images were acquired by NASA's Galileo spacecraft during its tenth orbit around Jupiter. The corresponding views of Io in reflected light are shown at the bottom. The white lines delimit Io's equator and longitudes of 0 (left) and 180 degrees (right). Io always keeps the same hemisphere (longitude 0) facing Jupiter, just as the nearside of the Moon always faces Earth. Furthermore, Io is not a perfect sphere; it is elongated along the axis which is radial to Jupiter (the "a" axis). The solid-body tides on Io have the greatest amplitude (about 50 meters) where the a axis intersects the surface, at the sub-Jupiter point (latitude 0, longitude 0) and at the anti-Jupiter point (latitude 0, longitude 180 degrees).

From these eclipse images we see evidence for enhanced concentrations of volcanic gases (dominantly SO2) at the sub- and anti-Jupiter regions. This enhanced degassing may be due directly to the tides or may be due to enhanced heat flow at depth below these regions.

North is to the top of the picture. The eclipse resolutions are 13.2 (left) and 63 (right) kilometers per picture element. The images were taken on September 18, 1997 (left) and October 5, 1997 (right) by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft.

Background Info:

The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC. JPL is an operating division of California Institute of Technology (Caltech).

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.

Cataloging Keywords:

Name Value Additional Values
Target Io Earth, Jupiter, Moon
System Jupiter Earth
Target Type Satellite Earth, Planet
Mission Galileo
Instrument Host Galileo Orbiter
Host Type Orbiter
Instrument Solid-State Imaging (SSI)
Extra Keywords Color, Eclipse, Volcano
Acquisition Date
Release Date 1997-12-10
Date in Caption 1997-09-18 1997-10-05
Image Credit NASA/JPL/University of Arizona
Source photojournal.jpl.nasa.gov/catalog/PIA01094
Identifier PIA01094