Abstract
RECENTLY, Cowling and Borger1 have put forward theoretical reasons why the electric conductivity of the ionospheric D-region may be considerably less than that of the combined E–F-regions. On the further postulate that tidal motions increase with height in the ionosphere, they conclude that a recent deduction2 concerning the origin of the solar and lunar magnetic variations is improbable.
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References
Cowling and Borger, Nature, 161, 515 (1948).
Martyn, Nature, 160, 535 (1947).
Martyn, Proc. Roy. Soc. (in the press).
Martyn, Proc. Roy. Soc. (in the press).
McNish, Terr. Mag. and Atmos. Elect., 42, 109 (1937).
Cowling, Mon. Not. Roy. Ast. Soc., 93, 90 (1933).
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MARTYN, D. Electric Conductivity of the Ionospheric D-Region. Nature 162, 142–143 (1948). https://doi.org/10.1038/162142a0
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DOI: https://doi.org/10.1038/162142a0
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