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Further Investigations of the Amplitude Variations of Downcoming Wireless Waves

  • J. L. Pawsey (a1)

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Experiments are described for measuring the lateral deviation of wireless waves after reflection from the E and F regions of the ionosphere. It was found that the greatest lateral deviation observed, 20° or more, was that due to the e region, and the least, about 0·5°, was due to the normal E region in the case of a distant transmitter.

The time variation of amplitude of a reflected wave was found to be consistent with a random scattering at the ionosphere.

In the theoretical discussion it is shown that changing horizontal irregularities, ion clouds, are a very important cause of fading. Values are calculated for the average fading periods which would result from the horizontal winds in the neighbourhood of the E region known to exist from other evidence. These calculated periods agree with the observed and it is inferred that horizontal winds are a very important cause of fading.

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References

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(1)Ratcliffe, and Pawsey, , Proc. Cambridge Phil. Soc. 29 (1933), 301.
(2)Ratcliffe, and White, , Proc. Phys. Soc. 45 (1933), 399.
(3)de Boer, , Tijdschrift v. h. Nederlandsch. Radiogenootschap. Jan., Feb. (1931).
(4)Rayleigh, Lord, Collected Works, 1, 495.
(5)Størmer, , Univ. Observatory Oslo, Publication No. 6.
(6)Trowbridge, , Astrophysical Journal, 26 (1907), 95.

Further Investigations of the Amplitude Variations of Downcoming Wireless Waves

  • J. L. Pawsey (a1)

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