Short-Period Variations in the Ionosphere

Article metrics

Abstract

DURING the years 1938 and 1939 fixed-frequency pulse observations were being used to record continuously the virtual height and echo intensity of reflexions from the F-region at two frequencies close to the vertical penetration frequency for the region. It was noticed that, in the daytime, the penetration frequency often showed quasi-periodic fluctuations with periods of the order of half an hour. The magnitude of the fluctuation was variable but frequently of the order of 1 Mc./s. from maximum to minimum.

References

  1. 1

    Nature, 162, 886 (1948).

  2. 2

    Proc. Inst. Rod. Eng. (Nov. 1947).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

MUNRO, G. Short-Period Variations in the Ionosphere. Nature 163, 812–814 (1949) doi:10.1038/163812a0

Download citation

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.