Planetary Pressure Wave of 4- to 5-Day Period in the Tropics

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Abstract
Surface pressure data during the International Geophysical Year period for 76 stations in the tropical zone 20°N–20°S have been examined to investigate the propagation characteristics, if any, of the 4- to 5-day pressure oscillations. Cross-spectrum analysis with a first-difference filter and the Tukey window has been employed. The phase spectrum shows that the 4- to 5-day oscillations result from a westward moving wave having a periodicity of 4–5 days and wave number 1. The direction of propagation is identical in both hemispheres and shows no inclination to latitude circles.

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