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Related Experiment Video

Updated: Jun 16, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Sky brightness and polarization during the 1973 african eclipse.

|February 6, 2010

Summary

Sky color and polarization changed dramatically during a 1973 solar eclipse. Measurements showed decreased sky radiance and polarization, with spectral shifts toward blue at the zenith and red at the horizon.

Area of Science:

Atmospheric optics
Solar eclipses
Radiative transfer

Background:

Solar eclipses significantly alter atmospheric conditions.
Understanding sky radiance and polarization is crucial for atmospheric studies.

Purpose of the Study:

To measure the absolute intensity, color, and polarization of the sky during the June 30, 1973, solar eclipse.
To analyze changes in zenith sky radiance, spectral distribution, and polarization ratio.

Main Methods:

Absolute intensity, color, and polarization measurements of the sky.
Analysis of zenith sky radiance, spectral distribution, and polarization ratio.
Comparison of results with radiative transfer models.

Main Results:

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Zenith sky radiance decreased by a factor of 10,000 during totality.
Sky spectral distribution shifted towards blue at the zenith and reddened at the horizon.
Polarization ratio decreased significantly from 0.45 to 0.04, influenced by surface albedo.

Conclusions:

Observed sky changes during the eclipse are consistent with a double-scattering radiative transfer model.
Surface albedo plays a significant role in the distribution of sky polarization.