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Abstract
Measurements of electron concentration in the D- and lower E-regions of the ionosphere are reported for seven rocket flights from South Uist, Scotland, in April 1973. They took place during a 12-hour period starting 30 hours after the main phase of a severe geomagnetic storm. The principal feature of the results is that the electron concentrations below 85 km varied between 4 and 10 times the concentrations found on normal days. The variability was correlated with changes in radio wave absorption. The observed electron concentrations are compared with results of other workers for storm conditions and in particular with the model of Spjeldvik and Thorne (1975), and are found to be in reasonable agreement. The possibility of changes in positive ion composition occurring during the post-storm period is inferred.
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