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Ye Hong
Hyo-Suk Lim


Evidence for the 30–60-day oscillation was found in the rainfall data that were retrieved from Special Sensor Microwave/Imager brightness temperatures from January to December 1989. Spectral analysis of daily rainfall showed that the strongest rainfall oscillations were located from 5°S to 5°N and extend from about 60°E to 180°. The oscillation propagated eastward at a speed of approximately 4 m s−1 along the equatorial Indian–western Pacific Ocean area. Northward propagation at a speed of about 1.5 m s−1 was also detected from 15°S to 30°N over the Indian Ocean between early May and late July.

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