Simultaneous observations of back-scatter and forward-scatter meteoric echoes have been made by means of a high-power 33 Mc./sec. pulse transmitter at Ottawa, with identical receiving systems at Ottawa and at Scarboro, 337.8 km. distant. Two-way transmissions, employing a low-power transmitter at Scarboro, were also used to measure absolute time delays. The approximate position of each meteor was plotted from the observed time delays, which enabled corrections to be applied to the echo durations for variations in antenna patterns and other factors, and which also determined the forward-scatter angle, [Formula: see text], for each meteor. In the majority of cases an enhancement was observed in the forward-scatter duration relative to the back-scatter duration. The data were divided into a short-duration or underdense group and a long-duration or overdense group. Assuming a theoretical forward-scatter enhancement proportional to [Formula: see text], it was found that the exponent, m, was 1.73 for the underdense group and 1.13 for the overdense group.
