TIA's Glossary of Telecommunication Terms
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equivalent noise resistance
A quantitative representation in resistance units of the spectral density of a noise-voltage generator, given by R n = (
W n)/(kT 0), where W n is the spectral density, k is Boltzmann's constant, T 0 is the standard noise temperature (290 K), and kT 0 = 4.00 × 10-21 watt-seconds. Note: The equivalent noise resistance in terms of the mean-square noise-generator voltage, e 2, within a frequency increment, 
f , is given by R n = e 2/(4kT 0f ).