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Math Help - Solar downward directed radiation flux

  1. #1
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    Solar downward directed radiation flux

    What is the value of the solar downward directed radiation flux reaching the surface in your town at noon on 4th July. 20% coverage of cumulus cloud.
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  2. #2
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    Re: Solar downward directed radiation flux

    The irradiance on a surface located on Earth and pointed perpendicular to the Sun is called the Solar Constant. Irradiance has unit \text{W/m}^2. If you look up Solar Constant on Wikipedia you'll quickly find its value.

    In your case your surface is probably not pointed perpendicular to the Sun. The effective irradiance then becomes:
    I=\cos(\theta)\cdot S
    in which \theta is the angle between the surface perpendicular and the Sun and S is the Solar Constant. You can easily find the value of the angle by using this nifty calculator.

    Then still multiply by the loss factor due to cloud coverage.
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