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Airglow and Aurora Australis

By: Alex Cherney

 

Region: Australia and Pacific

Site: Victoria - Australia

Date: October 2012

This enhanced all-sky video shows the dynamic of airglow and appearance of aurora in the dark southern sky. The Milky Way and the fainter band of the Zodiacal Light also appear in the view. Aurora Australis dances over the southern horizon (bottom) at the beginning and the end of the night. Airglow is more easily seen near the horizon and it keeps the night sky from ever being completely dark or entirely black in color. The airglow is banded has wave-like motion which is known as Atmospheric Gravity Waves (not to be mistaken with Gravitational Wave in Physics). Airglow is natural emission of the Earth upper atmosphere (~100km high) which is usually faint (in the visible light) and colorless to the eyes. It is due to chemiluminescence, the production of light in a chemical reaction, and found around the globe. The chemical energy is provided by the Sun's extreme ultraviolet radiation. Alex Cherney, Terrastro.com

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