The Novaya Zemlya effect: An arctic mirage

Lehn, Waldemar H.

doi:10.1364/josa.69.000776

Cited by 31 publications

(22 citation statements)

References 3 publications

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“…Siebren van der Werf, a retired nuclear physicist at the University of Groningen, Netherlands, published two articles (van der Werf et al ., ,b) and a book on the subject, describing the Novaya Zemlya effect as the mirage of an astronomical object appearing in the duct (van der Werf, ). Waldemar Lehn, Professor Emeritus of Electrical and Computer Engineering at the University of Manitoba, offers a broader interpretation: The definition of the Novaya Zemlya effect has been generalized to include all phenomena that involve the trapping of light rays (Lehn, ).…”

Section: The Novaya Zemlya Effect Sunsetmentioning

confidence: 99%

Sunset mirages involving ducts

Zinkova¹

2017

Weather

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Sunset mirages are often observed in coastal California. Cold ocean currents and warm air from inland create great conditions for temperature inversions, prerequisite required for producing mirages. Most sunset mirages seen in California are so called mock mirages. Inferior mirages are also common during winter time. On a rare occasions California sky watchers are treated by some special mirages that involve ducting, including Novaya Zemlya effect sunsets, blank strip sunsets and others.

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Section: The Novaya Zemlya Effect Sunsetmentioning

confidence: 99%

Sunset mirages involving ducts

Zinkova¹

2017

Weather

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“…The Novaya Zemlya effect is caused by optical ducting, in which light rays are trapped within a temperature inversion. 79 Figure 13 is a schematic drawing that illustrates the effect. The inversion exists where the cold air lies beneath the warm air.…”

Section: Keplermentioning

confidence: 99%

Atmospheric refraction: a history

Lehn¹,

Werf²

2005

Appl. Opt.

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We trace the history of atmospheric refraction from the ancient Greeks up to the time of Kepler. The concept that the atmosphere could refract light entered Western science in the second century B.C. Ptolemy, 300 years later, produced the first clearly defined atmospheric model, containing air of uniform density up to a sharp upper transition to the ether, at which the refraction occurred. Alhazen and Witelo transmitted his knowledge to medieval Europe. The first accurate measurements were made by Tycho Brahe in the 16th century. Finally, Kepler, who was aware of unusually strong refractions, used the Ptolemaic model to explain the first documented and recognized mirage (the Novaya Zemlya effect).

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“…The effect bears some resemblance to the conduction of light inside a glass fibre and has been named the "Novaya Zemlya Effect." For a full description and references to documented observations of the effect, the reader is referred to the work of Lehn (Lehn, 1979;Lehn and German, 1981).…”

Section: The Moon-jupiter Conjunction Of 25 January 1597mentioning

confidence: 99%

“…The effect has only recently been understood as a ducting phenomenon of light through multiple reflection against an inversion layer ( Lehn, 1979;Lehn and German, 1981) and it has been named the "The Novaya Zemlya Effect." This paper will discuss to what extent De Veer's description fits the characteristics of the effect as we understand it today.…”

Section: Introductionmentioning

confidence: 99%

Astronomical Observations During Willem Barents's Third Voyage to the North (1596-97)

Werf

1998

ARCTIC

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ABSTRACT. During Willem Barents's third voyage to the North and the wintering on Novaya Zemlya (1596 -97), many astronomical observations were made. Solar declinations quoted in the diary of Gerrit de Veer indicate that the journal dates are correct within three days and that the Gregorian calendar was used throughout. The much-debated premature return of the sun on 24 January 1597, when it was geometrically below the horizon, fits many, but not all, of the characteristics of the arctic mirage that is now known as the Novaya Zemlya effect. This same effect might also explain the controversial report of a conjunction of Jupiter and the moon on 25 January 1597, when Jupiter would normally not have been visible. It is shown, however, that the occurrence of the conjunction during that night could have been concluded from following the positions of the moon and Jupiter for several hours. An analysis of latitude determinations made at the expedition's wintering place, Het Behouden Huys, indicates that typical measurements had an accuracy of 15' -20'. In the Novaya Zemlya region, the variation of the earth's magnetic field was about 30˚W 400 years ago, and about 23˚E in 1871, and it is about 32˚E today. During the return voyage in two open boats, Barents died on 20 June 1597. A reconstruction of that part of the route is presented. A Dutch-Russian expedition searched for Barents's grave in August 1995; however, it appears most likely that he was buried at sea.

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The Novaya Zemlya effect: An arctic mirage

Cited by 31 publications

References 3 publications

Sunset mirages involving ducts

Sunset mirages involving ducts

Atmospheric refraction: a history

Astronomical Observations During Willem Barents's Third Voyage to the North (1596-97)

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