Influx of stratospheric air into the lower troposphere increased after solar Hα flares, X ray flares and after passages of solar magnetic sector structure boundaries

Abstract

A previous, tentative study of the question whether solar events will increase the frequency of influxes of stratospheric air into the lower troposphere, was corroborated by considerable augmentation of the data. It has now been established significantly for the period from late 1969 through 1972, that the frequency of injections of stratospheric air will multiply after Hα and X ray flares, and also after passages of solar magnetic sector boundaries. Additionally, during periods of several months' duration, with increased solar activity, a relation to the relative sunspot number was demonstrated. It thus appears obvious that we must look to certain solar events for the main triggering process causing injections of stratospheric air. Although the causality structure involved is not cleared up, as yet, prognostic application of the finding is nevertheless possible.