Abstract

Storm-time variations of electron content measured at Auckland, New Zealand and of F2-layer critical frequency measured at Australasian stations have been examined. Increases of electron content are found to be associated with a class of ‘S-events’ which are defined in terms of magnetic D st variations. The results of previously published storm-time variations have been reconsidered. It is suggested that the variety of forms of F2-layer storm variations is due to the coexistence of two opposing effects on electron concentrations.

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