Abstract
IT has been definitely established that the ionosphere responsible for carrying radio waves round the curved surface of the earth is divided into two clearly distinguishable regions1,2. The lower—the classical Kennelly-Heaviside or the E layer—is situated at a height of about 90 km., and the upper —the Appleton or the F layer—is situated at a height of about 200 km. The nature of the ionising agencies producing these two different layers is, however, not yet definitely known.
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References
Appleton, NATURE, 120, 330, Sept. 3, 1927.
Mitra and Rakshit, Phil. Mag., 15, 20 1933.
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MITRA, S., RAKSHIT, H., SYAM, P. et al. Effect of the Solar Eclipse on the Ionosphere. Nature 132, 442–443 (1933). https://doi.org/10.1038/132442a0
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DOI: https://doi.org/10.1038/132442a0
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