Letter | Published:

Electric Conductivity of the Ionospheric D-Region

Nature volume 162, pages 142143 (24 July 1948) | Download Citation



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 EF-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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  1. 1.

    and , Nature, 161, 515 (1948).

  2. 2.

    , Nature, 160, 535 (1947).

  3. 3.

    , Proc. Roy. Soc. (in the press).

  4. 4.

    , Proc. Roy. Soc. (in the press).

  5. 5.

    , Terr. Mag. and Atmos. Elect., 42, 109 (1937).

  6. 6.

    , Mon. Not. Roy. Ast. Soc., 93, 90 (1933).

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  1. Australia House, London, W.C.2. April 27.

    • D. F. MARTYN


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