Abstract
Five minor stratospheric warmings occurring in the 1983-84 winter, and sensed by reversal of thermospheric winds, are examined. Evidence is presented of neutral atmosphere - ionospheric coupling occurring over large areas with minima in radio-wave absorption coinciding with the warmings. D-region electron concentrations are depleted by day and lower E-region electron concentrations depleted by night. Vertical transport effects, linked to the horizontal winds, are invoked as the probable cause of the movement of ionisable constituents (e.g., nitric oxide) or ionisation, required to explain the observations.
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