Abstract
We have observed a 6‐min‐period oscillation persisting for an hour in the ionospheric E region following a 5‐kt chemical explosion on the ground 250 km south of the measurement site. The oscillation's phase velocity in the upper atmosphere is 0.15 km/s at an azimuth 60°W. Our observations are obtained using a time‐delayed correlation technique with multistation Doppler sounding of the overhead ionosphere. Some new aspects of the technique are described.
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