Rare odd‐radius column arcs

Riikonen, Marko; Moilanen, Jarmo; Sillanpää, Mika; Nieuwenhuys, Frank

doi:10.1256/wea.176.02

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…In addition to producing concentric circles, some displays by column and plate oriented crystals also produce column and plate arcs. (Riikonen et al ., ).…”

Section: February 2016 San Francisco Odd‐radius Halo Displaymentioning

confidence: 97%

Ice halos in weather lore and meteorology, and a rare halo display in San Francisco

Zinkova

2018

Weather

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From Aristotle to modern science, this article presents several accounts of ice halo displays in weather lore and answers questions such as Could a sighting of a halo be an omen of a shipwreck? Does a halo herald a hurricane? How are ice halos observed in Oklahoma connected to plankton from the Pacific Ocean? and others. The article also offers images and descriptions of a very rare odd‐radius solar halo display, observed in California on 23 February 2016, in which the Sun appeared to be surrounded by five concentric circles. Finally, the article analyses the meteorological conditions associated with this phenomenon, alongside those of other displays, and answers a question that has been asked for many thousands of years: can halo displays be used as indicators of the weather?

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“…In addition to producing concentric circles, some displays by column and plate oriented crystals also produce column and plate arcs. (Riikonen et al ., ).…”

Section: February 2016 San Francisco Odd‐radius Halo Displaymentioning

confidence: 97%

Ice halos in weather lore and meteorology, and a rare halo display in San Francisco

Zinkova

2018

Weather

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“…This display is discussed in more detail by Riikonen et al [59]. They also analyze another display of odd radius column arcs, a display that had been considered much earlier-in 1975-by Hattinga Verschure [24].…”

Section: Some Real Displaysmentioning

confidence: 99%

Atmospheric halos and the search for angle X

2006

Choice Reviews Online

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“…These pyramidal crystals produce odd-radius arcs, and recently there has been evidence for singly aligned pyramidal crystals. 18 M. Riikonen et al suggest column arcs resulting from Parry-aligned pyramidal crystals may one day be observed. Figure 6 shows a simulation made with pyramidally capped hexagonal cylinder crystals having an alternate Parry alignment.…”

Section: E Ice Crystal Arcsmentioning

confidence: 99%

Speculations on the possible causes of the Whymper apparition

Hardwick¹,

Knievel²

2005

Appl. Opt.

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During the first ascent of the Matterhorn, a remarkable optical effect comprising three crosses surrounded by a great arch was observed by Edward Whymper, the British mountaineer. The authors review previous published explanations of the apparition. There are no photographs, only a woodcut and sketch, so the size of the apparition is not known, and it is not possible to make a definitive conclusion about what caused it. A fogbow and ice crystal arcs could have produced a circle and crosses in a direction consistent with the apparition. Some simulations are presented; one has a form approximating Whymper's sketch. However, while this simulation used a crystal type that can occur, it required an unusual alignment that would be very rare.

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Rare odd‐radius column arcs

Abstract: The effect of wind speed and direction on the distribution of sewage-associated bacteria.

Cited by 4 publications

References 4 publications

Ice halos in weather lore and meteorology, and a rare halo display in San Francisco

Ice halos in weather lore and meteorology, and a rare halo display in San Francisco

Atmospheric halos and the search for angle X

Speculations on the possible causes of the Whymper apparition

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