Power Spectrum of Sporadic-E at Wilkes and Byrd Stations, Antarctica


Chivers and Hargreaves1 have reported the occurrence of quasi-periodic variations in the time series of high-frequency radiowave absorption at high-latitude conjugate locations. The absorption is of the type known as ‘auroral zone absorption’ (Type II) which is thought to result from ionization in the upper D-region produced by keV energy electrons dumped from, or freshly accelerated in, the outer Van Allen region of the magnetosphere. We report here periodic variations of the ionospheric sporadic-E layer in Antarctica with similar frequency and latitude characteristics. These results may have considerable importance in suggesting a theory of high-latitude sporadic-E.

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    Chivers, H. J. A., and Hargreaves, J. K., Nature, 202, 891 (1964).

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    Blackman, R. B., and Tukey, J. W., The Measurement of Power Spectra (Dover, New York, 1958).

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    Welch, J. A., and Whitaker, W. A., J. Geophys. Res., 64, 909 (1959).

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    McIlwain, C. E., J. Geophys. Res., 66, 3681 (1961).

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NOEL, T., BENNETT, S. Power Spectrum of Sporadic-E at Wilkes and Byrd Stations, Antarctica. Nature 207, 1182–1183 (1965). https://doi.org/10.1038/2071182b0

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