Abstract
This note presents some VLF data from a short, high-latitude path recorded during a stratospheric warming event in February 1969. Based on ionosonde data and VLF results it is concluded that no large changes in D-region electron density occurred over North Norway during the event. The VLF observations, showing daytime phase retardation and constant amplitude during the stratwarm, can be explained by assuming a height increase of 3 km for the atmosphere at VLF reflection levels (about 60 km). Height data for constant-pressure levels in the stratosphere make such an assumption reasonable.
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