Abstract
IN our recent letter to NATURE1, we did not mean to infer that reflections from the 60 km. level had not been found before. So early as 1930, Appleton2 noticed reflections of this type. In 1935, Mitra and Syam3 recorded reflections from this level using the pulse method of Breit and Tuve. The only addition we made to existing knowledge was that this high level forms the top of a region extending from 40 km. to 55 km. and that there is a lower region from 5 km. to 30 km. high. Practically the same discovery was made in England by Watson Watt and his co-workers4. In accordance with Mitra's suggestion5, we propose to call these the D and C regions.
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References
NATURE, 137, 782 (1936).
Appleton, Proc. Roy. Soc., A, 126, 542 (1930)
Mitra and Syam, NATURE, 135, 953 (1935). Syam, Ind. J. Phys. 10, Part 1, 13 (1936).
Watson Watt, Bainbridge-Bell, Wilkins, Brown, NATURE, 137, 866 (1936).
Mitra, NATURE, 137, 867 (1936).
Stevens, Nat. Geog. Mag., 59, 693 (1936). NATURE, 137, 896 (1936).
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COLWELL, R., FRIEND, A., HALL, N. et al. The Lower Regions of the Ionosphere. Nature 138, 245 (1936). https://doi.org/10.1038/138245b0
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DOI: https://doi.org/10.1038/138245b0
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