Abstract
EXPERIMENTAL results1 show that the attenuation rate of extremely-low frequency radio waves decreases with decreasing-frequency in the range from a few kc/s to about 70 c/s, below which it appears to increase again. The experimental results, however, are not yet fully confirmed. Moreover, theoretical work to date has given no indication that this behaviour would be expected. It has been suggested1, however, that it might be possible to explain the observations by considering a stratified ionosphere consisting of three homogeneous layers having different conductivities. Although a two-layer model was considered, no calculations have so far been given for the more complicated case.
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References
Jean, A. G., Murphy, A. C., Wait, J. R., and Wasmundt, D. F., J. Res. Nat. Bur. Stand., 65D, 475 (1961).
Bremmer, H., Handbuch der Physik, 16 (Springer-Verlag, 1958).
Burman, R., and Gould, R. N., J. Atmos. Terr. Phys. (in the press).
Wait, J. R., J. Res. Nat. Bur. Stand., 64D, 387 (1960).
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BURMAN, R., GOULD, R. Extremely Low-frequency Radio Propagation in an Inhomogeneous Ionosphere. Nature 199, 581–582 (1963). https://doi.org/10.1038/199581a0
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DOI: https://doi.org/10.1038/199581a0
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