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The significance, for ionospheric and other studies, of the experimental data given in part I is considered. It is shown how the data obtained from rocket soundings may be combined with the measurements of wave interaction in the ionosphere and the laboratory data given in part I, to estimate the height at which wave interaction occurs and the collisional frequency at that height. The following topics are also discussed: the theory of electronic motion in direct and alternating fields; the power communicated to a free electron in a gas by an alternating field; and the interaction of radio waves in the ionosphere.

Experimental and theoretical studies of the behaviour of slow electrons in air. II. Ionospheric and other applications