by APOD Robot » Wed Jun 04, 2014 4:10 am
A Green Flash from the Sun
Explanation: Many think it is just a
myth. Others think it is true but its cause isn't known. Adventurers pride themselves on having seen it. It's a
green flash from the
Sun. The truth is the
green flash does exist and its cause is well understood. Just as the setting
Sun disappears completely from view, a last glimmer appears startlingly
green. The effect is typically visible only from locations with a low, distant horizon, and lasts just a few seconds. A
green flash is also visible for a rising
Sun, but takes better timing to spot. A dramatic
green flash, as well as an even more rare
red flash, was caught in the above photograph recently
observed during a sunset visible from the
Observatorio del Roque de Los Muchachos in the
Canary Islands,
Spain. The
Sun itself does
not turn partly
green or red -- the effect is caused by layers of the
Earth's atmosphere acting like a
prism.
[/b]
[url=http://apod.nasa.gov/apod/ap140604.html][img]http://apod.nasa.gov/apod/calendar/S_140604.jpg[/img] [size=150]A Green Flash from the Sun[/size][/url]
[b] Explanation: [/b] Many think it is just a [url=http://www.mythweb.com]myth[/url]. Others think it is true but its cause isn't known. Adventurers pride themselves on having seen it. It's a [url=http://www.exo.net/~pauld/physics/atmospheric_optics/green_flash.html]green flash[/url] from the [url=http://en.wikipedia.org/wiki/Sun]Sun[/url]. The truth is the [url=http://mintaka.sdsu.edu/GF/]green flash[/url] does exist and its cause is well understood. Just as the setting [url=http://apod.nasa.gov/apod/sun.html]Sun[/url] disappears completely from view, a last glimmer appears startlingly [url=http://en.wikipedia.org/wiki/Green]green[/url]. The effect is typically visible only from locations with a low, distant horizon, and lasts just a few seconds. A [url=http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/redsun.html]green flash[/url] is also visible for a rising [url=http://asterisk.apod.com/viewtopic.php?f=24&t=18012]Sun[/url], but takes better timing to spot. A dramatic [url=http://apod.nasa.gov/apod/ap040321.html]green flash[/url], as well as an even more rare [url=http://www.weatherscapes.com/album.php?cat=optics&subcat=red_flash]red flash[/url], was caught in the above photograph recently [url=http://www.youtube.com/watch?v=jYkwmW0rGrM]observed[/url] during a sunset visible from the [url=http://www.iac.es/eno.php?op1=2&lang=en]Observatorio del Roque de Los Muchachos[/url] in the [url=http://en.wikipedia.org/wiki/Canary_Islands]Canary Islands[/url], [url=http://en.wikipedia.org/wiki/Spain]Spain[/url]. The [url=http://apod.nasa.gov/apod/ap070129.html]Sun[/url] itself does [i] not [/i] turn partly [url=https://www.youtube.com/watch?v=qZDCBVy22W8]green or red[/url] -- the effect is caused by layers of the [url=http://www.sciencemadesimple.com/sky_blue.html]Earth's atmosphere[/url] acting like a [url=http://en.wikipedia.org/wiki/Dispersive_prism]prism[/url].
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