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The detection and characterization of the physical properties of very distantgalaxies will be one the prominent science case of all future Extremely LargeTelescopes, including the 39m E-ELT. Multi-Object Spectroscopic instruments arepotentially very important tools for studying these objects, and in particularfiber-based concepts. However, detecting and studying such faint and distantsources will require subtraction of the sky background signal (i.e., between OHairglow lines) with an accuracy of ~1%. This requires a precise and accurateknowledge of the sky background temporal and spatial fluctuations. Using FORS2narrow-band filter imaging data, we are currently investigating what are thefluctuations of the sky background at ~9000A. We present preliminary results ofsky background fluctuations from this study over spatial scales reaching ~4arcmin, as well as first glimpses into the temporal variations of suchfluctuations over timescales of the order of the hour. This study (and othercomplementary on-going studies) will be essential in designing thenext-generation fiber-fed instruments for the E-ELT.

Characterizing the red optical sky background fluctuations from narrow-band imaging