Abstract
The conflict between the observed phase of the pressure tide at ground level and that required in the dynamo region to produce the observed magnetic variations led to the conclusion that a phase reversal must occur at some level in the atmosphere. The phase of the pressure tide as indicated by density variations at altitudes between 85 and 110 km, deduced from photographic observations of meteors, is here found to be intermediate between that observed at ground level and that required by dynamo theory. This suggests that the reversal occurs at approximately the level of the photographic meteors.
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