Abstract
Observations taken with the International Ultraviolet Explorer (IUE) detected a 0.28 µm absorption feature on Callisto's leading and Jupiter‐facing hemispheres. This feature is similar to Europa's 0.28 µm feature, however it shows no correlation with magnetospheric ion bombardment. The strongest 0.28 µm signature is seen in the region containing the Valhalla impact. This absorption feature also shows some spatial correlation to possible neutral wind interactions, suggestive of S implantation (rather than Sx) into Callisto's water ice surface. Indications of possible temporal variations (on the 10% level) are seen at other wavelengths between the '84–'86 and the '96 observations.
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