Observations taken with the International Ultraviolet Explorer (IUE) show the first detection of temporal changes in the UV spectral reflectance of the Jovian quadrant of Europa's leading side between 15¿--75¿ longitude over a time scale considered extraordinarily short for a large planetary object (commensurate with possible resurfacing events). The central trailing side region displays a 0.28 &mgr;m SO2 absorption that has remained constant in relative depth over the past decade to within the instrument detection limits. A new 0.33 &mgr;m absorption feature is seen on the leading side. ¿ 1998 American Geophysical Union