Ulloa's bow

Ulloa's bow
   Also known as glory. The eponym Ulloa's bow refers to the Spanish naval officer, explorer, and astronomer Antonio de Ulloa y de Torre-Giral (1716-1795). It is used in meteorology to denote a * physical illusion consisting of one or more colourful rings or arches, which have their colours arranged in the reverse order of those in a * rainbow. Sometimes these colourful rings or arches can be seen within a white luminous ring or arch called an * Ulloa circle. Both phenomena are sometimes seen in mountainous regions, typically in foggy weather, while facing a direction opposite the Sun (i.e. the antisolar point). In the past this used to be a rare experience worthy of publication. However, today Ulloa's bow is a common phenomenon seen by airline travellers looking down upon clouds opposite the Sun. Ulloa is commonly credited with having been the first to record Ulloa's bow and the Ulloa circle, after having observed them during an expedition in what is now Ecuador, between 1735 and 1739. Although the mediation of Ulloa's bow is not fully understood, a central part is attributed to the interaction of sunlight and droplets of water less than 25 im in radius suspended in the air. When Ulloa's bow is accompanied by a * Brocken spectre, the term * Brocken bow is used. Because of its lack of a tangible substratum in the extra-corporeal world, Ulloa's bow is also classified as a * fiction illusion.
   References
   Juan, J., de Ulloa, A. (1748). Relacion historica del viaje a la America Meridional hecho de orden de su Majestad. Madrid: Juan de Zuniga.
   Lynch, D.K., Futterman, S.N. (1991). Ulloa's observations of the glory, fogbow, and an unidentified phenomenon. Applied Optics, 30, 3538-3541.
   Lynch, D.K., Livingston, W. (1995). Color and light in nature. Cambridge: Cambridge University Press.

Dictionary of Hallucinations. . 2010.

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Look at other dictionaries:

  • ulloa's bow — noun see ulloa s ring …   Useful english dictionary

  • ulloa's ring — noun or ulloa s bow or ulloa s circle ü(l)ˈyōəz Usage: usually capitalized U Etymology: after Antonio de Ulloa died 1795 Spanish naval officer and scientist : fogbow …   Useful english dictionary

  • Ulloa circle —    Also known as circle of Ulloa, Ulloa ring, Ulloa s ring, Ulloa s halo, Bouguer s halo, white rainbow, and fogbow. The eponym Ulloa circle refers to the Spanish naval officer, explorer, and astronomer Antonio de Ulloa y de Torre Giral (1716… …   Dictionary of Hallucinations

  • brocken bow —    The name Brocken bow refers to the Brocken, a peak in the Harz mountains in Germany. It is used as a synonym for the terms glory and *Ulloa s bow, provided that the latter phenomenon is accompanied by a * Brocken spectre.    References… …   Dictionary of Hallucinations

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  • fiction illusion —    Also known as fiction. Both terms refer to a type of * visual illusion characterized by the absence of a tangible substratum in the extracorporeal world. Some examples of fiction illusions are the * rainbow, * Buddha s halo, the *Ulloa circle …   Dictionary of Hallucinations

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