Twilight and Faint Purple Light

On 12th September the late twilight showed a weak but distinctive purple arch due to scattering from particles very high in the atmosphere.

On the 14th it was even more prominent with a delicate lilac tint towards the end of main twilight.

By the 17th the sunset showed nothing unusual.

Canon EOS 20D   12th, 14th and 17th September 2009
Wiltshire, England

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