Consists of scattering from atmospheric gasses Is wavelength dependent Scattering increases as the wavelength becomes shorter.
Atmospheric particles have a diameter smaller than the incident wavelength.
Dominant at elevations of 9 to 10km above the surface. Blue light is scattered about four times as much as red light and UV light about 16 times as red light. Causes the blue color of the sky and the brilliant red colors at sunset. Caused by dust, pollen, smoke and water droplets. Particles have a diameter roughly equal to the incident wavelength.