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Solar activity: intrinsic periodicities beyond 11 years

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Robert Cameron, Manfred Schuessler

Solar and Stellar Astrophysics · Submitted 13 Mar 2019

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Using this model as a null case, we show here that all local peaks with enhanced power, apart from the 11-year band, are consistent with realisation noise.

how it is stated · asserted 0.73 read the record →

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arXiv ID1903.05398 (version 1)
Pith IDMDEKQZ6H, Pith's permanent record of this paper and its review
CitationManfred Schuessler, Robert Cameron. "Solar activity: intrinsic periodicities beyond 11 years." arXiv:1903.05398 (2019). https://pith.science/paper/MDEKQZ6H
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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,423 input tokens.

What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.43 · human participants 0.02 · controlled comparison 0.55 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.95 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

Power spectra of solar activity based on historical records of sunspot numbers and on cosmogenic isotopes show peaks with enhanced power apart from the dominant 11-year solar cycle, such as the 90-year Gleissberg cycle or the 210-year de Vries cycle. In a previous paper we have shown that the overall shape of the power spectrum is well represented by the results of the generic normal form model for a noisy and weakly nonlinear limit cycle, with parameters all determined by observations. Using this model as a null case, we show here that all local peaks with enhanced power, apart from the 11-year band, are consistent with realisation noise. Even a $3\sigma$ peak is expected to occur with a probability of about 0.25 at least once among the 216 period bins resolved by the cosmogenic isotope data. This casts doubt upon interpretations of such peaks in terms of intrinsic periodicities of the solar dynamo process.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Power spectra of solar activity based on historical records of sunspot numbers and on cosmogenic isotopes show peaks with enhanced power apart from the dominant 11-year solar cycle, such as the 90-year Gleissberg cycle or the 210-year de Vries cycle. background 1.00 0.19 0.03 asserted 1.00
s1 In a previous paper we have shown that the overall shape of the power spectrum is well represented by the results of the generic normal form model for a noisy and weakly nonlinear limit cycle, with parameters all determined by observations. background 0.64 0.70 0.03 asserted 1.00
s2 Using this model as a null case, we show here that all local peaks with enhanced power, apart from the 11-year band, are consistent with realisation noise. result 0.94 0.94 0.88 asserted 0.73
s3 Even a $3\sigma$ peak is expected to occur with a probability of about 0.25 at least once among the 216 period bins resolved by the cosmogenic isotope data. result 0.89 0.63 0.08 asserted 0.82
s4 This casts doubt upon interpretations of such peaks in terms of intrinsic periodicities of the solar dynamo process. interpretation 1.00 0.41 0.63 hedged possibility 0.86

What kind of paper the classifier reports this is: theoretical result 0.61 · evidence from analysis of existing data 0.96.

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  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

Power spectra of solar activity based on historical records of sunspot numbers and on cosmogenic isotopes show peaks with enhanced power apart from the dominant 11-year solar cycle, such as the 90-year Gleissberg cycle or the 210-year de Vries cycle. In a previous paper we have shown that the overall shape of the power spectrum is well represented by the results of the generic normal form model for a noisy and weakly nonlinear limit cycle, with parameters all determined by observations. Using this model as a null case, we show here that all local peaks with enhanced power, apart from the 11-year band, are consistent with realisation noise. Even a $3\sigma$ peak is expected to occur with a probability of about 0.25 at least once among the 216 period bins resolved by the cosmogenic isotope data. This casts doubt upon interpretations of such peaks in terms of intrinsic periodicities of the solar dynamo process.

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