Current knowledge of the ionosphere and exosphere is reviewed with particular attention given to the problem of electron density determination. Several rocket ex¬periments designed to measure electron densities are out¬lined. One of these experiments is being implemented by the Ionosphere Research Laboratory. Theoretical consider¬ations and ground based instrumentation development rela¬ted to this experiment are discussed in detail. Plans for rocket launchings and further studies in conjunction with this experiment are presented.
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