Abstract
Abstract Long term variations of 2–3 yr in ionospheric absorption data observed at 2.132 MHz over Delhi (28.6°N, 77.2°E) were investigated. The association of this oscillation with that of the stratospheric quasi-biennial oscillation (QBO) in wind data, was examined. The anti-correlation coefficient between the QBO in radio absorption data in the lower ionosphere and wind data at 28 km altitude was found to be 0.8, significant at the 99% confidence level. One of the causes of the presence of the QBO in absorption data seems to be controlled by the QBO in lower stratosphere winds.
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