Abstract
The high energy disturbance in the South Pacific on 24 August 1968 generated long-period (10–15 min), high-velocity (600 m sec−1) atmospheric pressure waves observed on a large aperture (250 km) micro-barograph array. A vertical incidence ionospheric Doppler sounder (4.8 MHz), located at the center of the array, detected an ionospheric oscillation (at a height of ∼225 km) in high correlation with the ground-level pressure signal. Correlated ionospheric Doppler-shift and ground-level pressure signals were observed for both the short and long great-circle paths from the test site. The Doppler sounder signal is the result of vertical changes of the ionosphere accompanying the passage of the atmospheric wave which has been identified by Tolstoy and Herron as a surface gravity wave.
