The spatial distribution of noise source strength along a jet is investigated theoretically. It is found, in particular, that a “slice” of jet (section between two adjacent planes normal to the axis) in the region of similar profiles downstream of the potential core contributes asx−7, wherexis measured from a virtual origin near the nozzle. Because of this striking attenuation of strength with distance, the “fat” part of the jet may contribute much less to the total noise power than is commonly supposed on the basis of near‐field measurements.