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Ground illumination from a turbid cloudless sky.

M R Nagel

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study develops empirical equations to estimate maximum skylight illuminance under clear skies, considering atmospheric turbidity and solar altitude. The findings provide a new reference for cloud-free sky illuminance calculations.

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    Area of Science:

    • Atmospheric Physics
    • Illumination Engineering
    • Optical Remote Sensing

    Background:

    • Accurate estimation of skylight illuminance is crucial for various applications, including building design and solar energy.
    • Existing models often simplify atmospheric conditions, limiting their accuracy under specific circumstances.

    Purpose of the Study:

    • To develop empirical equations for predicting skylight illuminance.
    • To quantify the relationship between skylight illuminance, atmospheric turbidity, and solar altitude.
    • To estimate maximum possible illuminance from a cloud-free sky.

    Main Methods:

    • Development of empirical equations based on observational data.
    • Utilizing an improved approximation for Bemporad's airmass function.
    • Relating calculated illuminances to those of a standard Rayleigh sky.

    Main Results:

    • A set of empirical equations was established for clear sky conditions.
    • The equations successfully estimate skylight illuminance based on turbidity and solar altitude.
    • Maximum illuminance values for cloud-free skies were determined.

    Conclusions:

    • The developed empirical equations offer a more accurate method for calculating skylight illuminance.
    • These equations are valuable for applications requiring precise illumination data under clear skies.
    • The study contributes to a better understanding of atmospheric effects on daylighting.