Afterglow
An afterglow in
atmosphere.[6] In the case of alpenglow, which is similar to the Belt of Venus,[7] afterglow is used in general for the golden-red glowing light from the sunset and sunrise reflected in the sky, and in particularly for its last stage, when the purple light is reflected.[2][1] The opposite of an afterglow is a foreglow, which occurs before sunrise.[citation needed
]
Sunlight reaches Earth around civil twilight during
low-energy and low-frequency red component
.
During this part of civil twilight after sunset and before sundawn the red sunlight remains visible by scattered out broadly, producing the broader blue light of nautical twilight before or after the reddish light of civil twilight, while in combination with the reddish light producing the purple light.[5] This period of blue dominating is referred to as the blue hour
and is, like the golden hour, widely treasured by photographers and painters.
After the 1883 eruption of the volcano Krakatoa, a remarkable series of red sunsets appeared worldwide. An enormous amount of exceedingly fine dust were blown to a great height by the volcano's explosion, and then globally diffused by the high atmospheric winds. Edvard Munch's painting The Scream possibly depicts an afterglow during this period.
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Purple light with crepuscular shadow -
Sunset in Hong Kong after the 1991 eruption of Mount Pinatubo -
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An afterglow in Slovenian mountains, near Triglav Lakes Valley -
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An afterglow at a pier in Australia -
An afterglow on Kraków's housing estate
See also
References
- ^ a b "afterglow". AMS Glossary. American Meteorological Society. 2015-10-05. Archived from the original on 2015-10-05. Retrieved 2022-08-14.
- ^ a b "Full text of 'Weather Glossary'". Internet Archive. The Formula. 2022-01-14. Retrieved 2022-08-14.
- ^ "purple light". AMS Glossary. American Meteorological Society. Retrieved 2022-08-14.
- ^ "bright segment". AMS Glossary. American Meteorological Society. Retrieved 2022-08-14.
- ^ . Retrieved 2022-08-14.
- ^ PMID 12570266.
- ISSN 1431-9756.
External links
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