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Here are images taken by the Hubble Space Telescope of Io:
Image Thumbnail Title
Sulfur Gas in Pele's Plume Sulfur Gas in Pele's Plume
Hubble Clicks Images of Io Sweeping Across Jupiter Hubble Clicks Images of Io Sweeping Across Jupiter
Hubble Captures Volcanic Eruption Plume From Io Hubble Captures Volcanic Eruption Plume From Io
Rare Hubble Portrait of Io and Jupiter Rare Hubble Portrait of Io and Jupiter
Hubble Discovers Bright New Spot on Io Hubble Discovers Bright New Spot on Io
Evolution of the Ra Patera bright spot
Montage of Cycle 4 images of Io, 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.
Hubble Space Telescope Resolves Volcanoes on Io Hubble Space Telescope Resolves Volcanoes on Io
 

HST NICMOS Image of Io in Eclipse, 1.45 microns

J. Goguen, JPL ("First look" comments, 7/30/98), A. Lubenow, A. Storrs, Space Telescope Science Institute

The image on the left is an HST NICMOS image acquired while Io was in Jupiter's shadow on 7/19/98 at 14:44 UT. This 224 second exposure (NIC1, F145M filter, 0.043 arcseconds/pixel, Io diameter is 1.144 arcseconds) of Io's Jupiter-facing hemisphere shows thermal emission from numerous hot spots. The image on the right is a Voyager-based map of Io projected at the same scale and orientation. The dotted circle shows the outline of Io's disk when the brightest source is matched with the known eruption at Loki Patera. The bright and double source at the upper left of the image is in the vicinity of Kanehekili. A faint "diffraction ring" (?) can be seen around the bright sources accounting for the ring which extends beyond the limb near Kanehekili. Note the 2 strong sources at about 10 and 12 o'clock relative to Loki. The source near 10 o'clock appears to correspond to no obvious feature on the Voyager map. The full data set includes 2 micron polarimetry to look for compositional heterogeneity between the hot spots (HST Program #7319).