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The yellow color is due to the presence of pollutants in the smoke. Yellowish clouds caused by the presence of nitrogen dioxide are sometimes seen in urban areas with high air pollution levels. [22] Red, orange and pink clouds occur almost entirely at sunrise and sunset and are the result of the scattering of sunlight by the atmosphere.
Crepuscular rays usually appear orange because the path through the atmosphere at dawn and dusk passes through up to 40 times as much air as rays from a high Sun at noon. Particles in the air scatter short- wavelength light (blue and green) through Rayleigh scattering much more strongly than longer-wavelength yellow and red light.
Iridescent mid altitude clouds Iridescent polar stratospheric cloud at sunset over Aberdeen, Scotland Cloud iridescence, seen above the clouds covered with grey clouds, Pondicherry, India. Cloud iridescence or irisation is a colorful optical phenomenon that occurs in a cloud and appears in the general proximity of the Sun or Moon.
Mie scattering is responsible for the light scattered by clouds, and also for the daytime halo of white light around the Sun (forward scattering of white light). [6] [7] [8] Sunset colors are typically more brilliant than sunrise colors, because the evening air contains more particles than morning air.
Cirrus clouds typically appear delicate and wispy with white strands. In the Earth's atmosphere, cirrus are usually formed when warm, dry air rises, causing water vapor deposition onto mineral dust and metallic particles at high altitudes.
Type Ic clouds consist of metastable water-rich nitric acid in a solid phase. [8] Type II clouds, which are very rarely observed in the Arctic, have cirriform and lenticular sub-types [9] and consist of water ice only. [4] A stratiform type I PSC (white cloud above the orange tropospheric clouds), showing fine horizontal structures in the veil
Red, orange, and pink clouds occur almost entirely at sunrise/sunset and are the result of the scattering of sunlight by the atmosphere. When the Sun is just below the horizon, low-level clouds are gray, middle clouds appear rose-colored, and high clouds are white or off-white. Clouds at night are black or dark gray in a moonless sky, or ...
Here was this great white field of clouds solid against the blue." [30] The painting is a minimalist work that reduces the sky and clouds to distinct planes of color. Minimalism was a popular genre for young artists in the 1960s. O'Keeffe herself compared Sky above White Clouds I to the then-current work of American artist Kenneth Noland.