Abstract
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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References
Chivers, H. J. A., and Hargreaves, J. K., Nature, 202, 891 (1964).
Blackman, R. B., and Tukey, J. W., The Measurement of Power Spectra (Dover, New York, 1958).
Welch, J. A., and Whitaker, W. A., J. Geophys. Res., 64, 909 (1959).
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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DOI: https://doi.org/10.1038/2071182b0
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