The “Sky-coloured Clouds” again

Modelling of IR images of sky and clouds

A phenomenon of thermal radiation of real objects is used in systems of automatic target recognition (ATR). To develop effective algorithms, it is essential to know both radiation characteristics of the detected objects and characteristics of their surroundings. The paper presents a method of numerical modeling of clouds radiation and their environment in IR range. Experimental data registered ...

How the clear-sky angle of polarization pattern continues underneath clouds: full-sky measurements and implications for animal orientation.

One of the biologically most important parameters of the cloudy sky is the proportion P of the celestial polarization pattern available for use in animal navigation. We evaluated this parameter by measuring the polarization patterns of clear and cloudy skies using 180 degrees (full-sky) imaging polarimetry in the red (650 nm), green (550 nm) and blue (450 nm) ranges of the spectrum under clear ...

ruby of the sky

in a profoundly impressive verse in shahnameh, sky is likened to red ruby. the present paper is attempted to probe into the background of the conventional belief regarding the relationship between sky and stone, for the semantic structure of the verse is composed in such a way that it is not possible to consider this relationship as being a conceptualistic viewpoint so that one may establish so...

The red sky enigma over Svalbard in December 2002: a model using polar stratospheric clouds

An anomalous red glow due to scattered sunlight was observed at Longyearbyen (78 N, 15 E) on 6 December 2002 from 07:30 UT to 13:30 UT when the solar zenith angle varied between 100.7 and 104. A model for this red sky event using sunlight scattered in a two stage process by Polar Stratospheric Clouds (PSC) at 25 km is presented and demonstrated to be feasible. The model requires a significant f...

A hybrid approach to estimate the complex motions of clouds in sky images