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Fine structure in the sunspot spectrum-2 to 70 years

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Abstract

Application of a new data adaptive approach to power spectrum estimation has yielded evidence for a double solar cycle line in the Zurich sunspot time history. There is significant power from 8 to 15 yr in the spectrum with the primary line at 11.1 yr and three attendant multiplets that may be significant. The first four harmonics of the solar cycle are detected too. Quite marginal evidence for a peak at ∼65 yr in the spectrum is presented. These results closely correspond to those recently found in the geomagnetic spectrum.

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Currie, R.G. Fine structure in the sunspot spectrum-2 to 70 years. Astrophys Space Sci 20, 509–518 (1973). https://doi.org/10.1007/BF00642220

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  • DOI: https://doi.org/10.1007/BF00642220

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