Seigel, A. D., 1985: Notes and Correspondence: A comment on long waves in the Pacific Ocean. Journal of Physical Oceanography, 15 (12), 1881-1883.

Abstract: Surface currents near the equator in the eastern Pacific Ocean fluctuate with periods of 21-30 days. Channel model experiments determined that these changes in oscillations are attributed to variations in the intensity of the South Equatorial Current.