Index of Refraction See refractive index.
Index of Wetness The ratio of precipitation for a given year over the mean annual precipitation.
Complex Index of Refraction: m = n + i*k, where n is the normal index of refraction, i is sqrt(-1), and k is the absorption coefficient.
Complex Signal: A signal containing both amplitude and phase information.
refractive index"(Or index of refraction; also absolute refractive index.) The ratio of the free- space speed of light c, a universal constant, to the phase velocity of a plane harmonic electromagnetic wave in an optically homogeneous, ...
A radar target must have an index of refraction sufficiently different from that of the atmosphere to return a target signal to the radar by reflection, refraction, or scattering.
Thin lines typically are located ahead of a thunderstorm, but can be associated with cold fronts and dry lines. The thin line is caused by backscattering of the radar's pulse off of a gradient in the index of refraction of air (i.
 See also: Refraction, Water, Velocity, Light, Radar
  
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