Zodiacal light observations with the Infrared Space Observatory

ISO performed an extensive observing programme on the infrared zodiacal light, including multi-filter photometry of the global brightness distribution, observations of the asteroidal bands and cometary dust trails, and investigation of the small scale brightness fluctuation. The detailed determination of the spectral energy distribution of the zodiacal light, including mid-infrared spectrophotometry, opens the possibility for the separation of the main components of the infrared sky. The mid-infrared spectrum may provide information on the nature of the constituents, and on the size distribution of the interplanetary grains. Two years after the ISO mission we review the observations and summarize the results of ISOPHOT and ISOCAM.