A Semidiurnal Wind Oscillation with Short Vertical Wavelength Observed in the Tropical Lower Stratosphere

Abstract

Radar measurement of the tropical lower stratosphere at Jicamarca (12°S) reaffirmed the existence of a semidiurnal wind oscillation similar to that detected foremost at Arecibo (18°N), which has a vertical wavelength as short as 10km and a horizontal wind amplitude of 0.2-1ms^-1. It seems very important that the two measurements made in different hemispheres detect a similar type of semidiurnal oscillation, being significantly different from global tidal oscillations.