Abstract
A quasi-16-day oscillation has been found in measurements of ionospheric parameters and geomagnetic field strength in winter 1988. Data obtained from numerous magnetometers show that this oscillation is a global event. The horizontal phase velocities in the E- and F-regions of the middle latitudes demonstrate that the oscillation is a westward-traveling wave. The downward phase velocity and upward group velocity indicate that the oscillation source is located in the lower atmosphere.
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