Abstract
The gravity wave/quasi two‐day wave interaction is an example of gravity wave/large‐scale flow interaction, a subject of great interest but insufficient understanding. Here we present evidence, from MF radar data, for the quasi two‐day wave modulation of gravity wave activity in the summer mesosphere over Urbana, Illinois (40° 10′ 10″ N, 88° 09′ 36″ W). A composite analysis of two‐day wave events, identified using the meridional winds at 84 km, is performed on the four‐hour mean winds and four‐hour standard deviations about those means, the latter being representative of gravity wave activity. Our results show that quasi two‐day variations in the winds modulate gravity wave activity at higher altitudes.
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