Answers are grounded in this paper and cite their sources.
An electron density profile of the nighttime ionosphere was obtained by rocket observation of the Doppler shift of 10.2-kc/s signals transmitted from the ground. The experiment showed a layer between the usual E and F regions. Suggestions are made about future experiments of this kind.
No takes yet. Share an insight, caveat, or question.
D. G. Cartwright (1964) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: