Abstract
The 6.5‐day wave is a westward propagating zonal wave number 1 (s = 1) planetary wave that is prominent near equinox. The spatial‐temporal structure of the 6.5‐day wave seen in the United Kingdom Meteorological Office (UKMO) data in the stratosphere is found to be consistent with that obtained from Upper Atmosphere Research Satellite/High Resolution Doppler Imager (HRDI) measurements of horizontal winds and temperatures in the mesosphere/lower thermosphere (MLT). Two wave events are commonly observed before and after equinox at low latitudes in both UKMO and HRDI data. This paper focuses on a pair of such events in late 1994. The amplitude growth and phase decrease with altitude of the zonal wind 6.5‐day wave appear to be continuous between the two data sets for the period analyzed. Both wave events appear to grow from the stratosphere to the upper atmosphere at a rate consistent with the suggested vertical phase velocity. Such consistency between the two data sets establishes that the wave previously observed in the MLT is propagating from the stratosphere. Further analyses of the UKMO data shows the presence of the 10‐day s = 1 and 4‐day s = 2 waves that appear to be either nonlinearly coupled with the 6.5‐day wave or related through a common sourcing mechanism.
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