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Explaining the green flash

A spectacular green flash can sometimes be seen above the Sun as it sets. Kevin Mosedale explains how this phenomenon occurs

The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.

The refraction, scattering and absorption of light by Earth’s atmosphere depends on wavelength. Under the right conditions, the result is a green flash.

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