Abstract
RECENT observations at Calcutta1,2, at Morgan-town (U.S.A.)3 and Orfordness (England)4 have established beyond doubt the existence of ionized layers much below the Kennelly-Heaviside E layer. Not infrequently these layers act as good reflectors of radio waves. The topmost of these layers (sometimes called the D layer) is situated at an average equivalent height of 55 km. The next one lies between 20 km. and 35 km., and the lowest ones appear to be situated within the tropospheric region between heights of 5 km. and 15 km. (It has recently been suggested by Mitra5 that since the designation D is usually applied to the non-deviating absorbing tail of the E region, the new regions be called C regions. It would perhaps be convenient to call them, starting from the top, C1, C2, and (C3 regions.)
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References
S. K. Mitra and P. Syam, NATURE, 135, 953 (1935).
S. K. Mitra and J. N. Bhar, Science and Culture, 1, 782 (1936).
R. C. Colwell and A. W. Friend, NATURE, 137, 782 (1936).
R. A. Watson Watt, L. H. Bainbridge Bell, A. F. Wilkins and E. G. Bowen, NATURE, 137, 866 (1936).
S. K. Mitra, NATURE, 137, 867 (1936).
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RAKSHIT, H., BHAR, J. Some Observations on the C Regions of the Ionosphere. Nature 138, 283 (1936). https://doi.org/10.1038/138283a0
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DOI: https://doi.org/10.1038/138283a0
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