Fata Morgana & the Quest for UFO Evidence

By Allen Tiller, originally published on Paranormal New Zealand on 03/03/2014

 

 “Fata Morgana” sounds like the name of a sorceress from the legendary stories of King Arthur and the Knights of the Round Table, and believe it or not, that’s indeed where the term’s origins lie!
  However, it is also the name given to a complex atmospheric mirage that could explain at least some UFO reports in the Australian desert and outback, both day and night.

Many people report strange sightings in the Australian outback, day and night, of shimmering lights, glowing objects, and other unexplained phenomena, usually described as UFOs — unidentified flying objects. (Which, when you think about it, is a very broad category of objects, as anything you cannot identify that flies remains an unidentified flying object. The UFO community may need to create some more specific sighting categories — but that is a whole other area of discussion!)

  Have you ever driven your car on a hot summer’s day and noticed that watery mirage out on the horizon — the one you can never reach, but is always there? That is a type of mirage associated with hot surfaces, but it is more accurately described as an inferior mirage, rather than a Fata Morgana. The natural phenomenon behind these effects, however, is much more interesting than many people realise.

  A Fata Morgana can occur over land or sea. It is an optical phenomenon caused by refraction as light passes through layers of air with different temperatures and densities. Under normal atmospheric conditions, air tends to become cooler with increasing height. However, during a temperature inversion, warmer air can exist above a layer of colder, denser air.

  This is important because light rays bend as they pass through air of different densities. In a strong temperature inversion, the bending can become sufficiently pronounced to produce a superior mirage, where distant objects can appear elevated above their true position. Under more complex temperature profiles, multiple images can form, some inverted and some upright, stacked vertically and rapidly changing in appearance. This more extreme and complicated form is what is commonly called a Fata Morgana.

  What happens is that distant objects on or near the horizon become part of the mirage our eyes see. Because the light is refracted through layers of air with different temperatures and densities, the image can become distorted, stretched, compressed, inverted or vertically displaced.

Any object — let’s say a distant car on the horizon — can suddenly appear above the road, possibly distorted and apparently floating in the sky, moving quickly or changing shape. Sounds like some UFO sightings you’ve heard about, right?

 The interesting thing about these atmospheric mirages is that they can happen at night as well. In the Australian outback, the right combination of a warm day, a cool or cold night, calm conditions and relatively flat terrain can create the temperature structure necessary for unusual mirages to occur.

 Fata Morgana can make distant objects appear stacked horizontally or vertically, inverted, mirrored or distorted. In fact, it can distort objects so significantly that they become almost unrecognisable.

Now, before I go any further, we should distinguish a true Fata Morgana from an ordinary superior mirage or an inferior mirage. An ordinary superior mirage occurs when the miraged image appears above the true object. It is commonly associated with a temperature inversion, where colder air is trapped beneath warmer air. Light passing through these layers is refracted, causing distant objects to appear higher than they really are.

 A Fata Morgana is generally considered an extreme or particularly complex form of superior mirage. Instead of producing a simple displaced image, the atmosphere can produce multiple erect and inverted images that appear stacked on top of one another. These images can change rapidly, become stretched or compressed, and sometimes produce bizarre shapes that bear little resemblance to the original object.

 An inferior mirage, on the other hand, is the terminology used to describe the classic mirage most of us know, where what appears to be water can be seen in the distance, often beneath an object such as a sand dune, road or other landscape feature.

 This is the familiar “water on the road” effect seen on hot summer days. It occurs because the air close to a hot surface becomes warmer and less dense than the air above it, causing light rays to bend as they pass through the different layers. The apparent water is often actually a refracted image of the sky.

While both superior and inferior mirages are related to atmospheric refraction, there is more happening in a Fata Morgana. The temperature structure of the atmosphere can create multiple images and dramatic vertical distortions, making the phenomenon much more visually spectacular — and potentially much more confusing to an observer.

  As I said earlier in this article, a temperature inversion is an important part of many superior mirages and Fata Morgana effects, but the exact atmospheric structure is important. Under suitable conditions, a layer of air can act as an atmospheric duct, allowing light to travel much farther than it normally would while also being strongly refracted. This can allow distant objects or lights that would normally be hidden below the horizon to become visible to an observer.

This is where it gets a little weirder.

  A Fata Morgana can cause not only horizontal distortions but also significant vertical distortions, making a recognisable image into something totally unrecognisable to the human eye. The phenomenon can also produce considerable apparent magnification or vertical stretching.

  For a Fata Morgana to be visible to you, the viewer, the atmospheric conditions and temperature profile must be suitable for strong refraction. The geometry between the observer, the distant object and the atmospheric layers is also important. It isn't simply a matter of having hot air over cold air — the strength and structure of the inversion determine what kind of mirage is produced.

So, taking all that into account, it boils down to this…

  If you have the right weather conditions — say, a really hot day followed by a cool or cold, relatively calm night — an atmospheric temperature inversion can develop close to the ground. In suitable terrain, particularly flat or gently undulating country where cold air can become trapped, distant lights or objects may become visible through atmospheric refraction.

  And this is not just theoretical. In an experiment investigating the mysterious Min Min lights of the Australian outback, a distant vehicle was positioned approximately 10 kilometres away, beyond a slight rise in the landscape. Under suitable atmospheric conditions, observers were able to see the vehicle’s light apparently floating above the horizon. The following morning, a spectacular Fata Morgana was also observed under the same general atmospheric conditions.

 This is particularly interesting when considering reports of mysterious lights in remote parts of Australia. A distant car headlight, campfire or other light source can potentially be refracted by the atmosphere and appear to be somewhere it isn't, possibly even appearing to move as the observer or atmospheric conditions change.

  This does not debunk every UFO sighting, of course, far from it. But it certainly makes you think about many of the sightings you read about that happen in the Australian outback. Could Fata Morgana, superior mirages and other forms of atmospheric refraction be responsible for some of these sightings? The answer is quite possibly yes.

  But the important point is that each sighting needs to be considered on its own evidence. A strange light seen near the horizon under strong inversion conditions may have a very different explanation from a close-range object observed overhead.

And that is what makes the search for UFO evidence so interesting!

For more on how the effect works, please follow this link:

http://mintaka.sdsu.edu/GF/mirages/mirintro.html

Further Reading:

http://en.wikipedia.org/wiki/Fata_Morgana_(mirage))

http://english.pravda.ru/science/tech/19-04-2003/2614-light-0/

http://www.skepticblog.org/2012/04/05/terrifying-ufos-or-fata-morgana-mirages/

Researched and Written by © Allen Tiller, 2014 (re-edited 2026)

www.allentiller.com.au