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.
Effects are wavelength dependent and affect EM radiation mostly in the visible portion. Forces image to record the brightness of the atmosphere in addition to the target. Mostly important in humid areas, very effective at absorbing in portions of the spectrum between 5.5 and 7 micrometer and above 27 micrometer.