منابع مشابه
Mirages with atmospheric gravity waves.
The temperature inversions that produce superior mirages are capable of supporting gravity (buoyancy) waves of very low frequency and long wavelength. This paper describes the optics of single mode gravity waves that propagate in a four-layer atmosphere. Images calculated by ray tracing show that (1) relatively short waves add a fine structure to the basic static mirage, and (2) long waves prod...
متن کاملSimulation of mirages.
A mirage is seen when atmospheric refraction distorts or displaces an image. We describe a mirage simulator that uses digital imaging equipment to generate mirage images from normal photographs. The simulation program relocates horizonal image lines into positions that they appear to occupy, according to rays traced from observer to object. Image-brightness adjustments are not required; we show...
متن کاملBright superior mirages.
Superior mirages of unusual brightness are occasionally observed. Two such cases, photographed over the frozen surface of Lake Winnipeg, Canada, are documented. Visually, these mirages appear as featureless bright barriers far out on the lake. They are just images of the lake ice, yet the luminance in one case was 2.5 times (in the other, 1.7 times) the luminance of the ice surface in front of ...
متن کاملDistributed Ray Tracing of Mirages
To further increase the realism of ray tracing, we take the idea of distributed ray tracing and add on to it mirage rendering. Mirages are seen quite often in our daily lives, and in order to make computer generated images look as realistic as possible, it is necessary to add things, such as mirage rendering, that are seen in the natural world. Mirages are caused by light passing from colder ai...
متن کاملLong-range superior mirages.
Superior mirages of simple appearance are occasionally observed over distances exceeding 70 km. These mirages cannot be explained in terms of standard textbook models; rather, they are shown to arise from fairly complex atmospheres. Two observations of different types, observed at Resolute Bay, Canada, are presented. The first is the basic three-image mirage in which one inverted and one erect ...
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ژورنال
عنوان ژورنال: Nature
سال: 1898
ISSN: 0028-0836,1476-4687
DOI: 10.1038/058619d0