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I report on progress in my ongoing work with Professor Jayant Murthyconcerning the origin and nature of the diffuse ultraviolet backgroundradiation over the sky. We have obtained and are reducing a vast trove ofVoyager ultraviolet spectrometer observations of the diffuse backgroundshortward of Lyman alpha, including for the first time measurements made fromthe outermost regions of the solar system, where noise from solar-systemscattered (and then grating-scattered) solar Lyman alpha is lowest. Also, wehave obtained and are investigating the complete set of GALEX observations ofthe diffuse ultraviolet background longward of Lyman alpha. Preliminaryinvestigation appears to confirm that longward of Lyman alpha there exists acomponent of the diffuse ultraviolet background that is not dust-scatteredstarlight.

Progress in Understanding the Diffuse UV Cosmic Background