Galileo imaging of atmospheric emissions from Io.

@article{Geissler1999GalileoIO,
  title={Galileo imaging of atmospheric emissions from Io.},
  author={Paul E. Geissler and Alfred S. McEwen and Wing-H. Ip and Michael J. S. Belton and Torrence V. Johnson and William Henry Smyth and Andrew P. Ingersoll},
  journal={Science},
  year={1999},
  volume={285 5429},
  pages={
          870-4
        }
}
The Galileo spacecraft has detected diffuse optical emissions from Io in high-resolution images acquired while the satellite was eclipsed by Jupiter. Three distinct components make up Io's visible emissions. Bright blue glows of more than 300 kilorayleighs emanate from volcanic plumes, probably due to electron impact on molecular sulfur dioxide. Weaker red emissions, possibly due to atomic oxygen, are seen along the limbs, brighter on the pole closest to the plasma torus. A faint green glow… 
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