Letter | Published:

Maximum Entropy Power Spectrum of Long Period Geomagnetic Reversals

Abstract

CRAIN et al.1 computed a power spectrum of the proportions of normal polarity measurements during the Phanerozoic, and their results were used as parameters for a stochastic model for geomagnetic reversals2. New data presented by McElhinny3 warrant a re-examination of the power spectrum of reversals during the Phanerozoic. Whereas Crain et al.1 used a hanning window in an attempt to minimize the end effects of the short record, a radically different approach, proposed by Burg4, is used in this note. The purpose of this letter is to point out the existence of a powerful new method for the analysis of short records.

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References

  1. 1

    Crain, I. K., Crain, P. L., and Plant, M. G., Nature, 223, 283 (1969).

  2. 2

    Crain, I. K., and Crain, P. L., Nature, 228, 39 (1970).

  3. 3

    McElhinny, M. W., Science, 172, 157 (1971).

  4. 4

    Burg, J. P., Geophysics, 36, 661 (1971).

  5. 5

    Jones, R. A., Technometrics, 7, 531 (1965).

  6. 6

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

  7. 7

    Toman, K., J. Geophys. Res., 70, 1749 (1965).

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