Hubble Space Telescope Imaging and Spectroscopy of Io

1. Surface Composition and Temporal Changes

• Montage of Cycle 4 images of Io (March 1994), at four longitudes and five wavelengths.
  Left to right: Central longitude 121; 41; 302; and 231 W
  Top to bottom: Wavelength combinations 0.57, 0.79, 1.04 microns; 0.41, 0.57, 0.79 microns; and 0.34, 0.41, and 0.57 microns.
  
• Evolution of the Ra Patera bright spot.

  
  HST Press Release

• Preprint of 1997 paper (Icarus 127, 221), available here

2. Plumes and Atmosphere

• Pele plume, Io, seen against Jupiter: 0.26 - 0.41 microns, July 1996. HST Press Release

  
  

• Preprint of 1997 paper (Geophysical Research Letters 24 2471-2474) available here.

• Pillan plume, Io, seen against dark sky: 0.26 - 0.41 microns, July 1997.

  HST Press Release

  
  

• Cycle 8: Sulfur gas in the Pele plume, seen by HST. Reprint of Science article available via here
  
  
• Cycle 10: 10 orbits awarded for STIS spectroscopy of Io's atmosphere and the Prometheus plume. Analysis is under way.
  
  
• Cycle 11: 8 orbits awarded for continued STIS spectroscopy of the Pele plume.