Abstract
Two sounding rockets, Kappa-VIII-3 and -4, a detailed account of which will be published elsewhere, were fired at 15h. 32m. 00s. September 22 and 20h. 25m. 00s. September 26, 1960, in order to observe the vertical profiles of positive ion density in the ionosphere. The launching site was the Akita Rocket Range in Japan, of which the geographical co-ordinates are lat. 39° 34′ N. and long. 140° 04′ E. Simultaneous observation of the ionosphere in vertical incidence was made at the Akita Radio Wave Observatory of the Radio Research Laboratories, geographical co-ordinates lat. 39° 44′ N. and long. 140 ° 08′ E.
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