Astronomy Picture of the Day

APOD: 2023 March 28 ┴ A Multiple Green Flash Sunset
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APOD: 2023 March 28 ┴ A Multiple Green Flash Sunset
Credit & Copyright: T. Slovinsk÷ & P. Hor÷lek (IoP Opava); CTIO, NOIRLab, NSF, AURA
Explanation: Yes, but can your green flash do this? A green flash at sunset is a rare event that many Sun watchers pride themselvesßon having seen.ß Once thought to be a myth, a green flash is now understood to occur when the Earth's atmosphere acts like both a prism and a lens. Different atmospheric layers create altitude-variable refraction that takes light from the top of the Sun and disperses its colors, creates two images, and magnifies it in just the right way to make a thin sliver appear green just before it disappears. Pictured, though, is an even more unusual sunset. From the high-altitude Cerro Tololo Inter-American Observatory in Chile one day last April, the Sun was captured setting beyond an atmosphere with multiple distinct thermal layers, creating severalß mock images of the Sun.ß This time and from this location, many of those layers produced a green flash simultaneously. Just seconds after this multiple-green-flash event was caught by two well-surprisedßastrophotographers, the Sun set below the clouds.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
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Based on Astronomy Picture Of the Day

Publications with keywords: green flash - Sun
Publications with words: green flash - Sun
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