Sky quality

Sky quality parameters

  • Outline of the DIMMA seeing monitor at OT with the Moon
    Seeing

    Astronomical seeing (units arcesec) refers to the blurring or instantaneous image broadening of astronomical objects caused by turbulent mixing in the Earth's atmosphere due to the variations of the

  • A cloud over Teide
    Useful time and cloudiness

    The useful time depends on the weather conditions at the Observatories, mainly wind speed, relative humidity, cloudiness and sky transparency (that is depending on aerosol and precipitable water

  • Map of water vapour distributed around La Palma showing the drop in height, up to the level of the ORM, where the PWV is less than 2 mm.
    Water Vapour

    The water vapour (WV) is one of the constituent gases of the Atmosphere. Despite being a minor constituent, WV is a powerful greenhouse gas, with strong lines of absorption and emission in the IR