An
afterglow is a broad high arch of whitish or rosy light appearing in the
sky due to very fine particles of
dust suspended in the high regions of the
atmosphere. An afterglow may appear above the highest
clouds in the hour of deepening
twilight, or
reflected from the high
snowfields in
mountain regions long after
sunset. The particles produce a
scattering effect upon the component parts of
white light.

After the eruption of the
volcano Krakatoa in 1883, a remarkable series of
red sunsets appeared all over the world. These were due to an enormous amount of exceedingly fine dust blown to a great height by the volcano's explosion, and then globally diffused by the high atmospheric currents.
Edvard Munch's painting
The Scream possibly depicts an afterglow during this period.
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