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IQSYInternational Quiet Sun Year (1964-65)
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A major goal was to "aid in the co-ordination of normal and special observations, particularly throughout the Northern Hemisphere, relating to the physical conditions in the 20-90 km height range of the atmosphere" (WMO/ IQSY 1964, p.
An early definition for major SSWs based on temperature changes (WMO/ IQSY 1964) evolved to one using the reversal of the stratospheric zonal-mean zonal wind circulation, the basic concepts of which have endured in some form since the late 1970s.