Looking to the Blue Sky with Colored Patterns

TL;DR

This paper introduces a straightforward method using birefringent materials and polarizers to visualize the polarization patterns of the Earth's blue sky, enhancing educational understanding of atmospheric optics.

Contribution

It proposes a simple, hands-on experimental technique to observe skylight polarization, incorporating birefringence and polarization concepts for educational purposes.

Findings

Colored patterns reveal polarization directions.

Three methods to polarize skylight are demonstrated.

Technique enhances visualization of atmospheric polarization.

Abstract

This work presents a simple alternative technique to observe the polarization of the skylight on Earth. Using a birefringent material and a polarizer to look at the polarized light from the blue sky, it is possible to see a colored pattern that is associated to the birefringence of the material and the polarized light. Three different ways to polarize the light are also discussed in the context of the proposed experiment. Keywords: Blue sky, Rayleigh scattering, birefringence, polarization, education.