Abstract
FOR some time we have been studying the variation of height of the different layers of the ionosphere at different hours of the day and night by the well-known group-retardation method. The technique of Breit and Tuve1, with the later improvements suggested by Appleton and Builder2, has been adopted for emitting short radio pulses from an aerial system of half-wave Hertzian horizontal dipole type, fed by a Lecher system. The receiver with the recording system of cathode ray oscillograph is located at a distance of about 1·5 km. from the transmitter. It may be mentioned that the average equivalent height of the Kennelly-Heaviside, or E layer, is found to be 100 km., and that of the Appleton, or F layer, about 270 km. The observations have been taken with waves having frequency of 3·8 megacycles per second.
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References
Breit and Tuve, Phys. Rev., 28, 554 (1926).
Appleton and Builder, NATURE, 127, 970 (June 27, 1931).
Hanson and Hulburt, Phys. Rev., 37, 477 (1931).
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BANERJEE, S., SINGH, B. Effect of Lunar Eclipse on the Ionosphere. Nature 137, 583 (1936). https://doi.org/10.1038/137583a0
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DOI: https://doi.org/10.1038/137583a0
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