A combined investigation of sporadic-E ionisation was made in two rocket firings at Woomera, South Australia. This paper reports the results of positive ion density measurements by means of positive ion probes and compares them with separate wind shear observations. On the first occasion a sporadic-E-layer was found to occur at 111 km near mid-afternoon but the wind measurements were not successful. On the second occasion a layer was found at 108 km where there was a large (60 m/sec) westward component of the wind and a wind shear in the opposite sense to that predicted by the Whitehead-Storey theory. The layer was too high to have been dumped in the way suggested by Chimonas and Axford. © 1969.
