The Far Ultra-violet Background

The diffuse far-ultraviolet (FUV) background has received considerable attention from astronomers since the 1970's. initial impetus came hope of detecting UV radiation hot intergalactic medium. central importance FUV to physics (heating and ionization) atomic phases motivated next generation experiments. consensus view is that emission at high latitudes three components: stellar reflected by dust grains (diffuse Galactic light or DGL), other galaxies medium (extra-galactic EBL) a component unknown origin (and referred as "offset" component). During the1980's, there was some discussion decaying dark matter particles produced radiation. In this paper I investigate production photons conventional sources: line Hot Ionized Medium, two-photon Warm Medium low-velocity shocks, Lyman-beta fluorescence hydrogen several locales in Solar System (the interplanetary medium, exosphere thermosphere Earth). conclude two thirds arguably all offset can be explained sum processes listed above.