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Updated: Jun 15, 2026

Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Atmospheric scattering corrections to solar radiometry.

M A Box, A Deepak

|March 10, 2010

Summary

Solar radiometers measuring direct sunlight are affected by diffuse sky radiation. This study provides correction factors and algorithms to account for scattered radiation, improving atmospheric optical depth measurements and aerosol size distribution retrieval.

Area of Science:

Atmospheric optics
Radiometry
Aerosol science

Background:

Solar radiometers measure direct solar radiation but are affected by diffuse sky radiation.
Bouguer's transmission law (Beer-Lambert's law) requires corrections for scattered radiation to accurately determine atmospheric optical depth.

Purpose of the Study:

To discuss correction factors for diffuse radiation in solar radiometer measurements.
To present algorithms for retrieving aerosol size distribution using corrected data.
To improve the accuracy of atmospheric optical depth measurements.

Main Methods:

Theoretical analysis of diffuse radiation contributions (single and multiple scattering).
Development of algorithms for aerosol size distribution retrieval.

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Numerical simulations for radiometers with small fields of view (< 5 degrees) and clear skies (optical depths < 0.4).

Main Results:

Diffuse radiation contributes approximately 1% to the total intensity for small field-of-view radiometers under clear skies.
Single scattering by molecules and aerosols, and multiple scattering by molecules, are the main diffuse radiation contributors.
Aerosol multiple scattering is considered negligibly small.

Conclusions:

Correction factors for diffuse radiation are essential for accurate atmospheric optical depth measurements.
The developed algorithms aid in retrieving aerosol size distribution.
The findings will assist in designing more accurate solar radiometers.