Abstract
Quasi-periodic fluctuations (2–15 days) in ionospheric absorption along three radio paths in Central and Southern Europe are investigated for three winter periods 1985/86, 1986/87 and 1987/88. The periods of dominant fluctuations in absorption and the time variations of their amplitudes are similar for all radio paths and every winter period. The shorter-period fluctuations are found to be associated with enhancements of planetary wave two activity in the stratosphere (30 hPa, 60°N), while longer period fluctuations appear to be associated with intensification of planetary wave one activity in the stratosphere.
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