We develop a new method of measuring auroral absorption using only a single passive HF receiver detecting a large number of existing HF transmissions. Although the locations, strengths, and timetables of these sources are not known, their large number allows them to be treated statistically. Modeling the distribution of the sources and using the Foppiano and Bradley <1983> model for the propagation of the waves leads to a simulated pattern of received signals at the receiver as a function of time of day which agrees well with the observed pattern.