AFTERGLOW  , a broad high

arch of. whitish or rosy light appearing occasionally in the sky above the highest clouds in the hour of deepening twilight, or reflected from the high snow-fields in mountain regions long after sunset: The phenomenon is due to very fine particles of dust suspended in the high regions of the atmosphere that produce a scattering effect upon the component parts of white light . After the eruption of 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 that terrific explosion, and then universally diffused by the high atmospheric currents .