A radio propagation experiment designed to measure very low electron densities was flown over the sunrise period on July 15, 1964. Two strong sporadic E layers were noticed during each of the three flights, with densities of the order of 10 5 cm ‐3 The characteristics of these sporadic E layers are discussed in detail, with reference both to the characteristics of the radio signal propagated to the rocket, and to the detailed ionograms taken immediately preceding and following the flight.
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S. A. Bowhill (1966) studied this question.
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