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	Green flash - Wikipedia, the free encyclopedia
		Green flashes and green rays are rare optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible for a short period of time above the sun, or a green ray shoots up from the sunset point.
		However the flash or ray effects require a stronger layering of the atmosphere and a mirage which serves to magnify the green for a fraction of a second to a couple of seconds.
		The green flash phenomena that are not listed here - such as the cloud-top flash, which is usually seen as the Sun sinks into the coastal fog and sometimes also at distant cumulus clouds — are omitted because they are not fully understood.
	en.wikipedia.org /wiki/Green_flash (652 words)

	APOD: 2002 November 10 - A Green Flash from the Sun (Site not responding. Last check: 2007-10-15)
		The truth is the green flash does exist and its cause is well understood.
		green flash is also visible for a rising Sun, but takes better timing to spot.
		A dramatic green flash was caught in the
	antwrp.gsfc.nasa.gov /apod/ap021110.html (146 words)

	The Green Flash (Site not responding. Last check: 2007-10-15)
		Few people have seen the green flash, yet it is one of the most startling and colourful of sunset or sunrise phenomena, requiring patience and good luck to be seen.
		Green and blue light are refracted by air slightly more than red light, so the disk actually consists of a flattened red disk, with a yellow disk slightly above it, a green disk above that, and blue and violet disks at the top.
		But I was rewarded with one final green flash as I was waiting on the evening of the 10th of September for a local flight from Kona airport, which is built on the west coast of the Big Island (height 4 metres).
	www.star.ucl.ac.uk /~mmd/greenfla.html (1567 words)

	The Green Flash (Site not responding. Last check: 2007-10-15)
		The green flash is the momentary change in color of the top portion of the sun when it's on the horizon.
		The green flash occurs at sunset or sunrise but is more often observed at day's end simply because more people are awake to see it.
		It never happened, and I began to regard the green flash as myth or worse, a deliberate hoax, one of the initiation torments inflicted by old hands on greenhorns.
	www.48north.com /jan99/greenflash.htm (615 words)

	The Green Flash, Alaska Science Forum (Site not responding. Last check: 2007-10-15)
		The green flash may last only a second or so near the time when the first edge of the sun comes up in the morning, or the last edge goes down in the evening.
		The green flash is the result of the atmosphere acting like a weak prism to bend each color of the sun's light by different amounts.
		The green flash was familiar to the ancient Egyptians who apparently saw it often in the clear desert air.
	www.gi.alaska.edu /ScienceForum/ASF2/209.html (310 words)

	The Green Flash
		But seriously, folks, the green flash is a somewhat common phenomenon that occurs during the last few seconds of sunset or the first few seconds of sunrise.
		Green flashes are reported more frequently in tropical regions or coastal areas because this is where the likelihood of a long clear air path is the greatest.
		Taking photographs of the green flash requires some special camera equipment, such as a telephoto lens and a tripod, but not many people bother and this explains why photographs of the phenomenon are rare.
	www.mbay.net /~mzelus/greenflash.html (1380 words)

	Green Flash Pictures - Green Flash photos - Green Flash prints - Green Flash posters (Site not responding. Last check: 2007-10-15)
		The center of the flash is green, but the edges of the flash are bluish in color.
		Most of the green flashes I've seen begin at the outer edges of the setting sun and then quickly move towards the center.
		The green flash was brillant green, like an emerald lit from within resting on the ocean horizon.
	sandiegoprints.com /greenflash (813 words)

	Bear: Capturing a green flash
		It attributes green flashes to rays of the rising or setting sun passing obliquely through a thicker slab of atmosphere than when it is higher on the horizon.
		Since the flash lasts only a second and there are no instant replays, to see one, would-be observers must not only be in the right place at the right time but also be paying close attention to the horizon.
		Although theoretically green flashes can be seen almost anywhere there's a clear, unobstructed view of the distant horizon, say from a mountaintop, airplane or even a tall building, the places they're most commonly viewed are on east- or west-facing ocean shorelines.
	www.post-gazette.com /travel/20021222bearcolumn1222p4.asp (1035 words)

	Now during mid to late summer is the best time for sunset watchers to seek the green flash (Site not responding. Last check: 2007-10-15)
		Contrary to widespread belief, the green flash does exist and it is best seen when the sun goes down behind a distant horizon such as you get at sea or over the lake.
		You won't get a green flash on a sultry evening of haze and cloud when the sun becomes a brilliant red round ball and then fades into the gray murk hanging on the horizon.
		Minnaert writes with a bit of practice you can frequently see the green rim of the sun and when large temperature differences exist between land and water, conditions are especially favorable to see a flash.
	www.silverwaters.com /greenflash.htm (721 words)

	green flash
		green flash or emerald flash,a refractive phenomenon of the atmosphere where the top edge of the setting (or, less frequently, rising) sun will momentarily turn emerald green.
		The green flash occurs primarily because the atmosphere acts like a weak prism, refracting sunlight and separating it into different colors.
		Although green light is in roughly the middle of the spectrum, it is usually the last color to be seen by someone watching a sunset because blue and violet light are practically all absorbed by the contamination in the atmosphere, which scatters blue light and removes it from the line of sight.
	www.factmonster.com /ce6/sci/A0930510.html (226 words)

	BBC - Wiltshire - Weather - The Elusive Green Flash
		Green Flash: caused by the atmosphere acting like a giant prism, refracting the sunlight.
		Because just as the sun dips beyond the horizon there may, if you are very lucky, be a brief flash or pinpoint of green light - the green flash.
		As red light is refracted less than green light, the red sun lies closer to the horizon than the green 'inferior' mirage of the sun.
	www.bbc.co.uk /wiltshire/weather/green_flash.shtml (419 words)

	Mount Wilson Observatory
		The green flash is an atmospheric refractive phenomenon where the top edge of the Sun will momentarily turn green.
		The basic cause for the green flash is that refraction bends the light of the Sun.
		The green flash is best observed when you have a clear view of the horizon uncluttered by foreground objects and pollution free.
	www.mtwilson.edu /vir/parkinglot/greenflash (867 words)

	Red Sunset, Green Flash
		The famous but seldom seen "green flash" or "emerald flash" which occurs just before the last part of the sun disappears from view at sunset is caused by the same atmospheric refraction and scattering effects which produce the red sunset.
		Andrew Young contests this, stating that sunsets are so bright and provide so much light even in the green that significant bleaching of the pigment for both red and green may occur, certainly not the conditions for the scotopic or low-light vision.
		The green or blue would be seen only after the red image is gone, and the passage time for this 20 arc second band is reported by the Meinels to be about 1.4 seconds.
	hyperphysics.phy-astr.gsu.edu /hbase/atmos/redsun.html (704 words)

	Green Flash -<I> Le rayon vert</I> -- Photos of an Atmospheric phenomenon
		Some of my fellow Naturalists had told me that they'd been seeing green flashes lately, so it was in the back of my mind that I might see and photograph a green flash.
		Sunset sequence with the "Omega Sun" that is predictive of an observable inferior-mirage flash.
		It has long been known that this type of sunset is predictive of an observable green flash.
	home.centurytel.net /Arkcite/grnray.htm (456 words)

	The Straight Dope: Does the weather phenomenon called "green flash" really happen?
		Usually it's a thin green band or splotch visible for a split second at or near the top edge of the sun as it sinks beyond the horizon.
		Most people have never seen green flash and think it's a myth, ascribing it to retinal fatigue on the part of the observer or, in your case, the lingering effects of drugs.
		Green flash is caused by atmospheric refraction--that is, the bending of sunlight as it passes through the air so that it splits into a rainbow of colors.
	www.straightdope.com /classics/a880408.html (440 words)

	Jhamandas Watumull Planetarium - Bishop Museum
		Secondly, the green flash is best seen when the sun sets or rises over the ocean and only when it is absolutely clear all the way to the horizon.
		Another way to improve your chances of spotting the green flash is to observe from a location that provides a clear view of the sunrise or sunset.
		For green flash watchers on the neighbor islands, simply look for a west facing shore that is not obstructed by any land mass.
	www.bishopmuseum.org /planetarium/greenflash.html (904 words)

	The Green Flash
		This phenomenon is known as the "green flash" or "green ray." It is not an "optical illusion." It does not fill the sky with green light.
		The green flash is quite common and will be visible any time the Sun is rising or setting on a clear, unobstructed, and low horizon.
		Further explanations of the green flash are at http://mintaka.sdsu.edu/GF/explain/explain.html.
	www.redshift.com /~bcbelknap/GreenFlash.html (1227 words)

	Pictures of Green Flashes
		The orangish hue of the sky, and the visibility of blue in the flash, are indications of extremely clear air.
		The extreme flattening of the flash shows that it is caused by a thermal inversion; the fine diagonal structure within the flash is due to waves on that inversion.
		green ray” rarely associated with green flashes, even these are usually only a few degrees long, and share the brief time scale (a few seconds) of the commoner flashes.
	mintaka.sdsu.edu /GF/pictures.html (3771 words)

	The Green Flash
		A green flash is both a rare and spectacular event.
		However, we will discover that the opposite is true; a green flash has a higher probability of occurring in an unpolluted area and is the result of basic physics, namely optics.
		The Omega sunset resulting in a green flash is represented in a series of snapshot diagrams in Figure 6.
	merganser.math.gvsu.edu /david/reed05/projects/sekar-taylor/taylor/webpage.html (1199 words)

	Naples Florida Real Estate -- Green Flash
		Flashes are not always green; they are not a "flash" in the sense of a sudden burst of brightness (except at sunrise).
		Finally, because most green flashes are pretty puny, it helps a lot (especially if you are a beginner) to use a little optical aid: binoculars, field glasses, even opera glasses will do.
		All information deemed reliable but urge any person looking for a green flash to verify by their own means and to use caution and good sense in protecting their eyesight.
	www.ruthbethem.com /GreenFlash.htm (646 words)

	Welcome to Green Flash Brewing Co. (Site not responding. Last check: 2007-10-15)
		Green flashes are real phenomena seen at sunrise and sunset, when part of the sun suddenly changes color.
		Green flashes usually are brief, lasting only one or two seconds.
		Green flashes do not always light up the sky, but are often small and inconspicuous.
	www.greenflashbrew.com /whatis.html (125 words)

	Inferior Mirage Green Flash
		The classical green flash, a brilliant glint of green almost on the ocean horizon just as the sun disappears, relies on a mirage to magnify the usually small differences in refraction between red and green light.
		The mirage and green flash are sensitive to your height above sea level.
		They are the fluttery edge of the mirage and a sign that the sunset could be distorted with a green flash at its end.
	www.sundog.clara.co.uk /atoptics/gf2.htm (344 words)

	Sand, Sea, Surf and the GREEN FLASH
		Those lucky enough to have witnessed this elusive event describe it as an abrupt strong green flash, lasting mere seconds, that occurs at the top of the setting sun just as the last part of the disk is about to dip below the horizon.
		Although very thin, the green rim is magnified by the atmospheric lens so that a momentary -- and breathtaking -- pulse of green appears on the crest of the sun.
		So whether or not you ever catch the Green Flash, the everyday warmth of the Florida sunshine is cause for celebration.
	www.islandtime.com /islandlife/cindi/cp-green.htm (416 words)

	Green Flash (Site not responding. Last check: 2007-10-15)
		The green flash was explained by James Prescott Joule in a letter to the Manchester Literary and Philosophical Society in 1869.
		It is a greenish flash seen at the upper limb of the sun at sunset (and also at sunrise, but it is harder to observe then).
		The reader interested in the green flash is highly recommended to consult this website for everything there is to know about the subject, and many more pictures.
	www.du.edu /~jcalvert/astro/greenf.htm (179 words)

	Galax Lux Green Flash Gallery
		The Green Flash is an phenomenon seen at sunset and sunrise, when the top edge of the sun suddenly change color, turn from yellow or orange to green or rarely blue.
		I've seen the Green Flash for the first time several years ago, during a summer trip around the Lofoten and Vesteralen islands at the north of Norway.
		I observed a green flash for two or three seconds, it was memorable and wonderful moment, but unfortunately I did'nt register the flash on the film.
	www.intersoft.it /galaxlux/GreenFlashGallery.htm (191 words)

	Dead Zone Diary: The green flash (Site not responding. Last check: 2007-10-15)
		But if we were lucky, Nunnally said, we'd see the sun flash green for a brief second just as it was about to slip beneath the horizon.
		This so-called green flash has been seen on calm and cloudless horizons in waters the world over by sailors and scientific researchers, but on almost every cruise on the R/V Gyre its existence sparks some debate.
		However, I did notice a distinct flashing of green and blue which I attribute to an optical illusion, a trick of the eye, because my eyes were fixed on the sun as it set.
	blogs.chron.com /deadzone/archives/2005/05/the_green_flash.html (1188 words)

	Green flash
		This section owes much to green flash expert Andrew T Young and his site should be consulted for a definitive account.
		That on the left captured from Belgium by Florian Schaaf is an intense flash of emerald green as the last vestige of the sun sinks beneath the horizon.
		To the right, a detached green fragment on the setting sun, imaged in the Spanish Canary islands by Tony Cook, is the green flash more often photographed.
	www.sundog.clara.co.uk /atoptics/gf1.htm (282 words)

	VOYGRQuest News and Tips; The Green Flash (Site not responding. Last check: 2007-10-15)
		It, also, was not a case of the "false flash" as we were driving along the freeway and didn't have a chance to stare at the sun and have the "false flash effect." The conditions were not "perfect," either; but, then, I have looked for the flash when the conditions were perfect and saw nothing.
		Usually, it's a thin green band or splotch visible for a split second at or near the top edge of the sun as it sinks beyond or rises beyond the horizon.
		One reason they're so adamant is that the green flash is impossible to photograph with an ordinary camera--the image is too small to register.
	www.voygrquest.com /news/greenflash.html (560 words)

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