Earth:Fata Morgana (mirage)
File:Fata Morgana is changing shape of a distant boat.OGG A Fata Morgana (Italian: [ˌfata morˈɡaːna]) is a complex form of superior mirage visible in a narrow band right above the horizon. The term Fata Morgana is the Italian translation of "Morgan the Fairy" (Morgan le Fay of Arthurian legend). These mirages are often seen in the Italian Strait of Messina, and were described as fairy castles in the air or false land conjured by her magic.
Fata Morgana mirages significantly distort the object or objects on which they are based, often such that the object is completely unrecognizable. A Fata Morgana may be seen on land or at sea, in polar regions, or in deserts. It may involve almost any kind of distant object, including boats, islands, and the coastline. Often, a Fata Morgana changes rapidly. The mirage comprises several inverted (upside down) and erect (right-side up) images that are stacked on top of one another. Fata Morgana mirages also show alternating compressed and stretched zones.[1]
The optical phenomenon occurs because rays of light bend when they pass through air layers of different temperatures in a steep thermal inversion where an atmospheric duct has formed.[1] In calm weather, a layer of significantly warmer air may rest over colder dense air, forming an atmospheric duct that acts like a refracting lens, producing a series of both inverted and erect images. A Fata Morgana requires a duct to be present; thermal inversion alone is not enough to produce this kind of mirage. While a thermal inversion often takes place without there being an atmospheric duct, an atmospheric duct cannot exist without there first being a thermal inversion.
Observing a Fata Morgana
A Fata Morgana is most commonly seen in polar regions, especially over large sheets of ice that have a uniform low temperature. It may, however, be observed in almost any area. In polar regions the Fata Morgana phenomenon is observed on relatively cold days. In deserts, over oceans, and over lakes, however, a Fata Morgana may be observed on hot days.
To generate the Fata Morgana phenomenon, the thermal inversion has to be strong enough that the curvature of the light rays within the inversion layer is stronger than the curvature of the Earth.[1] Under these conditions, the rays bend and create arcs. An observer needs to be within or below an atmospheric duct in order to be able to see a Fata Morgana.[2] Fata Morgana may be observed from any altitude within the Earth's atmosphere, from sea level up to mountaintops, and even including the view from airplanes.[3][4]
A Fata Morgana may be described as a very complex superior mirage with more than three distorted erect and inverted images.[1] Because of the constantly changing conditions of the atmosphere, a Fata Morgana may change in various ways within just a few seconds of time, including changing to become a straightforward superior mirage. The sequential image here shows sixteen photographic frames of a mirage of the Farallon Islands as seen from San Francisco; the images were all taken on the same day. In the first fourteen frames, elements of the Fata Morgana mirage display alternations of compressed and stretched zones.[1] The last two frames were photographed a few hours later, around sunset time. At that point in time, the air was cooler while the ocean was probably a little bit warmer, which caused the thermal inversion to be not as extreme as it was few hours before. A mirage was still present at that point, but it was not so complex as a few hours before sunset: the mirage was no longer a Fata Morgana, but instead had become a simple superior mirage.
Fata Morgana mirages are visible to the naked eye, but in order to be able to see the detail within them, it is best to view them through binoculars, a telescope, or as is the case in the images here, through a telephoto lens. Gabriel Gruber (1740–1805) and Tobias Gruber (sl) (1744–1806), who observed Fata Morgana above Lake Cerknica, were the first to study it in a laboratory setting.
Etymology
La Fata Morgana ("The Fairy Morgana") is the Italian name of Morgan le Fay, also known as Morgana and other variants, who was described as a powerful sorceress in Arthurian legend. As her name indicates, the figure of Morgan appears to have been originally a fairy figure rather than a human woman. The early works featuring Morgan do not elaborate on her nature, other than describing her role as that of a fairy or magician. Later, she was described as a King Arthur's half-sister and an enchantress.[5] After King Arthur's final battle at Camlann, Morgan takes her half-brother Arthur to Avalon.[6] In medieval times, suggestions for the location of Avalon included the other side of the Earth at the antipodes, Sicily, and other locations in the Mediterranean.[7] Legends claimed that sirens in the waters around Sicily lured the unwary to their death. Morgan is associated not only with Sicily's Mount Etna (the supposedly hollow mountain locally identified as Avalon since the 12th century[8]), but also with sirens. In a medieval French Arthurian romance of the 13th century, Floriant et Florete, she is called "mistress of the fairies of the salt sea" (La mestresse [des] fées de la mer salée).[9] Ever since that time, Fata Morgana has been associated with Sicily in the Italian folklore and literature.[10] For example, a local legend connects Morgan and her magical mirages with Roger I of Sicily and the Norman conquest of the island from the Arabs.[11][12]
Walter Charleton, in his 1654 treatise "Physiologia Epicuro-Gassendo-Charltoniana", devotes several pages to the description of the Morgana of Rhegium, in the Strait of Messina (Book III, Chap. II, Sect. II). He records that a similar phenomenon was reported in Africa by Diodorus Siculus, a Greek historian writing in the first century BC, and that the Rhegium Fata Morgana was described by Damascius, a Greek philosopher of the sixth century AD. In addition, Charleton tells us that Athanasius Kircher described the Rhegium mirage in his book of travels.
An early mention of the term Fata Morgana in English, in 1818, referred to such a mirage noticed in the Strait of Messina, between Calabria and Sicily.[13]
Famous legends and observations
The Flying Dutchman
The Flying Dutchman, according to folklore, is a ghost ship that can never go home, and is doomed to sail the seven seas forever. The Flying Dutchman is usually spotted from afar, sometimes seen to be glowing with ghostly light. One of the possible explanations of the origin of the Flying Dutchman legend is a Fata Morgana mirage seen at sea.[14]
A Fata Morgana superior mirage of a ship can take many different forms. Even when the boat in the mirage does not seem to be suspended in the air, it still looks ghostly, and unusual, and what is even more important, it is ever-changing in its appearance. Sometimes a Fata Morgana causes a ship to appear to float inside the waves, at other times an inverted ship appears to sail above its real companion.
In fact, with a Fata Morgana it can be hard to say which individual segment of the mirage is real and which is not real: when a real ship is out of sight because it is below the horizon line, a Fata Morgana can cause the image of it to be elevated, and then everything which is seen by the observer is a mirage. On the other hand, if the real ship is still above the horizon, the image of it can be duplicated many times and elaborately distorted by a Fata Morgana.
The appearance of two ships changing owing to the Fata Morgana phenomenon: the four frames in the first column are of ship No. 1, and the four frames in the second column are of ship No. 2
In this mirage, at least three separate images of a boat are visible. The real one at the bottom and the uppermost one are in the upright position, whereas the one in the middle is inverted
Superimposed detail from six frames of a view showing how the miraged image of a ship changes from one moment to the next
Phantom islands
In the 19th and early 20th centuries, Fata Morgana mirages may have played a role in a number of unrelated "discoveries" of arctic and antarctic land masses which were later shown not to exist.[citation needed] Icebergs frozen into the pack ice, or the uneven surface of the ice itself, may have contributed to the illusion of distant land features.
Sannikov Land
Yakov Sannikov and Matvei Gedenschtrom claimed to have seen a land mass north of Kotelny Island during their 1809–1810 cartographic expedition to the New Siberian Islands. Sannikov reported this sighting of a "new land" in 1811, and the supposed island was named after him.[15] Three-quarters of a century later, in 1886, Baron Eduard Toll, a Baltic German explorer in Russian service, reported observing Sannikov Land during another expedition to the New Siberian Islands. In 1900, he would lead still another expedition to the region, which had among its objectives the location and exploration of Sannikov Land.[16] The expedition was unsuccessful in this respect.[17] Toll and three others were lost after they departed their ship, which was stuck in ice for the winter, and embarked on a risky expedition by dog sled.[18] In 1937, the Soviet icebreaker Sadko also tried and failed to find Sannikov Land.[19] Some historians and geographers have theorised that the land mass that Sannikov and Toll saw was actually Fata Morganas of Bennett Island.[15]
Croker Mountains
In 1818, Sir John Ross led an expedition to discover the long-sought-after Northwest Passage. When he reached Lancaster Sound in Canada, he sighted, in the distance, a land mass with mountains, directly ahead in the ship's course. He named the mountain range the Croker Mountains,[20] after First Secretary to the Admiralty John Wilson Croker, and ordered the ship to turn around and return to England. Several of his officers protested, including First Mate William Edward Parry and Edward Sabine, but they could not dissuade him.[21] The account of Ross's voyage, published a year later, brought to light this disagreement, and the ensuing controversy over the existence of the Croker Mountains ruined Ross's reputation. The year after Ross's expedition, in 1819, Parry was given command of his own Arctic expedition, and proved Ross wrong by continuing west beyond where Ross had turned back, and sailing through the supposed location of the Croker Mountains. The mountain range that had caused Ross to abandon his mission had been a mirage.
Ross made two errors. First, he refused to listen to the counsel of his officers, who may have been more familiar with mirages than he was. Second, his attempt to honour Croker by naming a mountain range after him backfired when the mountains turned out to be non-existent. Ross could not obtain ships, or funds, from the government for his subsequent expeditions, and was forced to rely on private backers instead.[22]
New South Greenland
Benjamin Morrell reported that, in March 1823, while on a voyage to the Antarctic and southern Pacific Ocean, he had explored what he thought was the east coast of New South Greenland.[23] The west coast of New South Greenland had been explored two years earlier by Robert Johnson, who had given the land its name.[24] This name was not adopted, however, and the area, which is the northern part of the Antarctic Peninsula, is now known as Graham Land.[25] Morrell's reported position was actually far to the east of Graham Land.[26] Searches for the land that Morrell claimed to have explored would continue into the early 20th century before New South Greenland's existence was conclusively disproven. Why Morrell reported exploring a non-existent land is unclear, but one possibility is that he mistook a Fata Morgana for actual land.[27]
Crocker Land
Robert Peary claimed to have seen, while on a 1906 Arctic expedition, a land mass in the distance. He said that it was north-west from the highest point of Cape Thomas Hubbard, which is situated in what is now the northern Canadian territory of Nunavut, and he estimated it to be 210 km (130 miles) away, at about 83 degrees N, longitude 100 degrees W. He named it Crocker Land, after George Crocker of the Peary Arctic Club.[28] As Peary's diary contradicts his public claim that he had sighted land,[29] it is now believed that Crocker Land was a fraudulent invention of Peary,[30] created in an unsuccessful attempt to secure further funding from Crocker.
In 1913, unaware that Crocker Land was merely an invention, Donald Baxter MacMillan organised the Crocker Land Expedition, which set out to reach and explore the supposed land mass. On 21 April, the members of the expedition did, in fact, see what appeared to be a huge island on the north-western horizon. As MacMillan later said, "Hills, valleys, snow-capped peaks extending through at least one hundred and twenty degrees of the horizon". Piugaattoq, a member of the expedition and an Inuit hunter with 20 years of experience of the area, explained that it was just an illusion. He called it poo-jok, which means 'mist'. However, MacMillan insisted that they press on, even though it was late in the season and the sea ice was breaking up. For five days they went on, following the mirage. Finally, on 27 April, after they had covered some 200 km (125 miles) of dangerous sea ice, MacMillan was forced to admit that Piugaattoq was right—the land that they had sighted was in fact a mirage (probably a Fata Morgana). Later, MacMillan wrote:
The expedition collected interesting samples, but is still considered to be a failure and a very expensive mistake. The final cost was $100,000 (equivalent to $1,900,000 in 2019).[32]
Hy Brasil
Hy Brasil is an island that was said to appear once every few years off the coast of County Kerry, Ireland. Hy Brasil has been drawn on ancient maps as a perfectly circular island with a river running directly through it.
Lake Ontario
Lake Ontario is said to be famous for mirages, with opposite shorelines becoming clearly visible during the events.[33]
In July 1866, mirages of boats and islands were seen from Kingston, Ontario.[34]
Here the described mirages of vessels "could only be seen with the aid of a telescope". It is often the case when observing a Fata Morgana that one needs to use a telescope or binoculars to really make out the mirage. The "cloud" that the article mentions a few times probably refers to a duct.
On 25 August 1894, Scientific American described a "remarkable mirage" seen by the citizens of Buffalo, New York.[35][36]
Scientific American, 25 August 1894.
This description might refer to looming owing to inversion rather than to an actual mirage.
McMurdo Sound and Antarctica
From McMurdo Station in Antarctica, Fata Morganas are often seen during the Antarctic spring and summer, across McMurdo Sound.[37][38][39] An Antarctic Fata Morgana, seen from a C-47 transport flight, was recounted:
Rear Adm. Fred E. Bakutis, commanding the Antarctic Navy Support Activities[37]
UFOs
Fata Morgana mirages may continue to trick some observers and are still sometimes mistaken for otherworldly objects such as UFOs.[40] A Fata Morgana can display an object that is located below the astronomical horizon as an apparent object hovering in the sky. A Fata Morgana can also magnify such an object vertically and make it look absolutely unrecognizable.
Some UFOs which are seen on radar may also be due to Fata Morgana mirages. Official UFO investigations in France indicate:
Australia
Fata Morgana mirages could explain the mysterious Australian Min Min light phenomenon.[42] This would also explain the way in which the legend has changed over time: The first reports were of a stationary light, which in a Fata Morgana effect would be an image of a campfire. In more recent reports this has changed to moving lights, which in an inversion reflection such as Fata Morgana would be headlights over the horizon being reflected by the inversion.
Greenland
Fata Morgana Land is a phantom island in the Arctic, reported first in 1907. After an unfruitful search, it was deemed to be Tobias Island.[43]
In literature
A Fata Morgana is usually associated with something mysterious, something that never could be approached.[44]
O sweet illusions of song
That tempt me everywhere,
In the lonely fields, and the throng
Of the crowded thoroughfare!
I approach and ye vanish away,
I grasp you, and ye are gone;
But ever by night and by day,
The melody soundeth on.
As the weary traveler sees
In desert or prairie vast,
Blue lakes, overhung with trees
That a pleasant shadow cast;
Fair towns with turrets high,
And shining roofs of gold,
That vanish as he draws nigh,
Like mists together rolled—
So I wander and wander along,
And forever before me gleams
The shining city of song,
In the beautiful land of dreams.
But when I would enter the gate
Of that golden atmosphere,
It is gone, and I wonder and wait
For the vision to reappear.
In the lines, "the weary traveller sees / In desert or prairie vast, / Blue lakes, overhung with trees / That a pleasant shadow cast", because of the mention of blue lakes, it is clear that the author is actually describing not a Fata Morgana, but rather a common inferior or desert mirage. The 1886 drawing shown here of a "Fata Morgana" in a desert might have been an imaginative illustration for the poem, but in reality no mirage ever looks like this. Andy Young writes, "They're always confined to a narrow strip of sky—less than a finger's width at arm's length—at the horizon."[1]
The 18th-century poet Christoph Martin Wieland wrote about "Fata Morgana's castles in the air". The idea of castles in the air was probably so irresistible that many languages still use the phrase Fata Morgana to describe a mirage.[9]
In the book Thunder Below! about the submarine USS Barb, the crew sees a Fata Morgana (called an "arctic mirage" in the book) of four ships trapped in the ice. As they try to approach the ships the mirage vanishes.[45]
The Fata Morgana is briefly mentioned in the 1936 H. P. Lovecraft horror novel At the Mountains of Madness, in which the narrator states: "On many occasions the curious atmospheric effects enchanted me vastly; these including a strikingly vivid mirage—the first I had ever seen—in which distant bergs became the battlements of unimaginable cosmic castles."
See also
- Atmospheric optics
- Brocken spectre
- Fata Morgana (1971 film)
- Green flash
- Looming and similar refraction phenomena
- Mirage of astronomical objects
- Summerland (2020 film)
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 An Introduction to Mirages by Andy Young
- ↑ Atmospheric Optics Glossary by Andy Young
- ↑ Durst and Bull (1956). Met. Mag. 85. pp. 237–42.
- ↑ Andrew, Young. Annotated bibliography of mirages, green flashes, atmospheric refraction, etc.. http://mintaka.sdsu.edu/GF/bibliog/bibliog.html.
- ↑ Briggs, Katharine (1978). "Morgan le Fay." In Encyclopedia of Fairies: Hobgoblins, Brownies, Boogies, and Other Supernatural Creatures, p. 303. New York: Pantheon. ISBN:0-394-73467-X.
- ↑ Bromwich, Trioedd Ynys Prydein, pp. 274–75
- ↑ Avalon in Norris J. Lacy, Editor, The Arthurian Encyclopedia (1986 Peter Bedrick Books, New York).
- ↑ "Fata Morgana". https://aty.sdsu.edu/mirages/FM/FM.html.
- ↑ 9.0 9.1 Vanishing Tricks of a Goddess by Imogen Rhia Herrad
- ↑ The Sea-side Companion, Or, Marine Natural History p. 33 by Mary Roberts
- ↑ "The Fata Morgana, Elusive Phenomenon in the Strait of Messina". 28 December 2020. https://www.calabriatheotheritaly.com/fata-morgana-strait-of-messina/.
- ↑ "The Count Roger and the Fata Morgana". 9 May 2012. https://www.timesofsicily.com/count-roger-and-the-morgana/.
- ↑ The Stanford Dictionary of Anglicised Words and Phrases, page 388, by Charles Augustus Maude Fennell, John Frederick Stanford
- ↑ Eyers, Jonathan (2011). Don't Shoot the Albatross!: Nautical Myths and Superstitions. A&C Black, London, UK. ISBN:978-1-4081-3131-2.
- ↑ 15.0 15.1 Mills, W. J., 2003, Exploring polar frontiers: a historical encyclopedia. ABC CLIO Publishers, Oxford, United Kingdom.
- ↑ Zyryanov P.N. (2012). Адмирал Колчак, верховный правитель России. 1356 (4th ed.). Moscow: Molodaya Guardia. pp. 41–42. ISBN 978-5-235-03375-7.
- ↑ Zyryanov P.N. (2012). Адмирал Колчак, верховный правитель России. 1356 (4th ed.). Moscow: Molodaya Guardia. p. 60. ISBN 978-5-235-03375-7.
- ↑ Zyryanov P. N. (2012). Адмирал Колчак, верховный правитель России. 1356 (4th ed.). Moscow: Molodaya Guardia. pp. 77–78. ISBN 978-5-235-03375-7.
- ↑ White, Calvin S. (16 May 1937). "U.S.S.R. Opens Far North". The New York Times. https://www.nytimes.com/1937/05/16/archives/ussr-opens-far-north-in-siberia-the-russians-are-developng-land-and.html.
- ↑ "Croker Mountains". http://libweb5.princeton.edu/visual_materials/maps/websites/northwest-passage/croker-mountains.htm.
- ↑ "John Ross – The Arctic and More – 19th century – Pathfinders and Passageways". http://www.collectionscanada.gc.ca/2/24/h24-1810-e.html.
- ↑ "Superior Mirage". http://www.athropolis.com/arctic-facts/fact-mirage.htm.
- ↑ Morrell, Benjamin (1832). A Narrative of Four Voyages ... etc. New York: J & J Harper. pp. 69–70. ISBN 9781927279137. https://books.google.com/books?id=g0AGAAAAMAAJ&q=Benjamin+Morrell.
- ↑ Mills, William James (2003). Exploring Polar Frontiers. Santa Barbara: ABC-CLIO. pp. 434–435. ISBN 978-1-57607-422-0. https://books.google.com/books?id=PYdBH4dOOM4C&q=Morrell+Land&pg=PA435.
- ↑ Mill, Hugh Robert (1905). The Siege of the South Pole. London: Alston Rivers. pp. 161–162. https://archive.org/details/siegeSouthpoles00Mill.
- ↑ Mill, Hugh Robert (1905). The Siege of the South Pole. London: Alston Rivers. p. 109. https://archive.org/details/siegeSouthpoles00Mill.
- ↑ Simpson-Housley, Paul (1992). Antarctica: Exploration, Perception and Metaphor. New York: Routledge. pp. 57–69. ISBN 978-0-415-08225-9. https://books.google.com/books?id=M1ql3mx8xYgC&q=New+South+Greenland+Antarctic&pg=PA51.
- ↑ "UI Alumni Association – Welcome". Alumni & Friends!. http://www.uiaa.org/urbana/illinoisalumni/0108_b.html.
- ↑ Rawlins, Dennis. "Contributions". http://www.dioi.org/cot.htm#crck.
- ↑ David Welky (2017). A Wretched and Precarious Situation: In Search of the Last Arctic Frontier.
- ↑ MacMillan, Donald Baxter; Ekblaw, Walter Elmer (1918). Four Years in the White North. Harper & Brothers. pp. 87–88. https://archive.org/details/cu31924029882879.
- ↑ "The UnMuseum – Mirages". http://unmuseum.mus.pa.us/mirage.htm.
- ↑ "The Mirage: Conditions that make possible this beautiful illusion". Buffalo Evening News: p. 5. 10 April 1909. https://www.newspapers.com/clip/21474307/buffalo_evening_news/. "Lake Ontario Is famous for beautiful and wonderful mirages, during which the opposite shore of the lake is plainly visible from either side."
- ↑ "Daily News (Kingston, ON), July 9, 1866: Maritime History of the Great Lakes". http://images.maritimehistoryofthegreatlakes.ca/19115/data.
- ↑ "A mirage at Buffalo". Scientific American 71: 115. 25 August 1894. https://books.google.com/books?id=YoA9AQAAIAAJ&pg=PA115.
- ↑ Miscellaneous Notes and Queries Vol. XII.. M. Gould, Manchester, N. H. 1894.
- ↑ 37.0 37.1 Perkinson, William J. (11 November 1966). "Optical illusions among strange effects of weather; winds give cold its severity". The Evening Sun (Baltimore, Maryland): p. C1. https://www.newspapers.com/clip/21474733/the_evening_sun/. "October is also the month when Antarctica's equivalent of the desert mirage occurs most frequently.
Script error: No such module "in5".On four of the five days during which the blizzard blew continuously, the Fata Morgana appeared and lasted from four to twelve hours.
Script error: No such module "in5".That's when phantom cliffs and coast lines are plainly visible.
Script error: No such module "in5".Mountains take on strange shapes, sometimes appearing to grow atop each other upside down. Other mountains seem displaced as peaks 120 miles [190 km] away or more can be seen as if they were just across the ice-covered McMurdo Sound.
Script error: No such module "in5".The Fata Morgana, Chief Horner explained, is an optical illusion caused when the air is clear by the fact that the air aloft is warmer than the air at the surface of Antarctica."
- ↑ "El Pasoan studies Antarctica weather". El Paso Herald–Post: p. B–1. 19 February 1973. https://www.newspapers.com/clip/21474739/el_paso_heraldpost/. "All the Navy weathermen at Detachment 'C' agree that the most startling weather phenomena they have encountered in Antarctica is 'Fata Morgana,' an optimal illusion that is caused by a temperature inversion over the ice and which makes everything look like a mirage and appear distorted or stretched.
Script error: No such module "in5".'It's amazing to look out towards the Ross Ice Shelf and see Mount Discovery or the Royal Society Mountain Range look almost inverted or stretched out for miles,' Miller said"
- ↑ "The Guys at Work". 7 October 2011. http://www.theguysatwork.com/blogs/uploaded_images/IMG_6910-731218.JPG.
- ↑ Webb, Steven (2002). If the universe is teeming with aliens – where is everybody?. New York: Copernicus. p. 30. ISBN 978-0-387-95501-8. https://books.google.com/books?id=Kp6g79LuKWEC&pg=PA30.
- ↑ V. R. Eshleman. Electromagnetic-Wave Ducting
- ↑ Pettigrew, John D. (2003) "The Min Min light and the Fata Morgana: An optical account of a mysterious Australian phenomenon", Clinical and Experimental Optometry, V86#2 pp. 109–120
- ↑ "Catalogue of place names in northern East Greenland". Geological Survey of Denmark. http://www.geus.dk/publications/bull/nr21/nr21_p117-368.pdf3.[yes|permanent dead link|dead link}}]
- ↑ Fata Morgana by Henry Wadsworth Longfellow.
- ↑ Fluckey, Eugene B. (1997). Thunder Below!: The USS Barb Revolutionizes Submarine Warfare in World War II. University of Illinois Press. pp. 34. ISBN 978-0252066702.
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