Long term periodicities in the sunspot cycle

Cohen, Theodore J.; Lintz, Paul R.

doi:10.1038/250398a0

Cited by 121 publications

(32 citation statements)

References 8 publications

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“…Variations in solar intensity, as recorded in the varying number of sunspots, display a strong periodicity at 10.7 years for the time period from 1860 to the present (Figure 3a, b), in agreement with previous work (Cohen andLintz, 1974, Berger et al, 1990). This sunspot cycle is very persistent and is relatively stationary in the sense that the period does not change appreciably over this time period; small variations from the 10.7-year cycle create side lobes in the power spectrum.…”

Section: Spectral Characteristics Of Potential Driverssupporting

confidence: 91%

The influence of regional and global climatic oscillations on Croatian climate

Bice¹,

Montanari²,

Vučetić³

et al. 2011

Intl Journal of Climatology

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ABSTRACT:We apply spectral analysis and sliding window correlations to monthly, seasonal, and annual climatological data from station records throughout Croatia going back to 1859 in order to investigate the potential influences of a set of important climatic drivers, including solar variability, and ocean-atmosphere oscillations in both the Pacific realm (El Niño-Southern Oscillation, ENSO and Pacific Decadal Oscillation, PDO) and the Atlantic realm (Atlantic Multidecadal Oscillation, AMO and North Atlantic Oscillation, NAO). In addition to a general long-term warming and drying, there are significant interannual to decadal scale variations. Positive phases of AMO correspond to higher Croatian temperatures and also times of greater interannual temperature variability. Higher frequency variations in NAO are positively correlated with temperature such that a negative phase of NAO is associated with lower Croatian temperatures. The strength of NAO's influence is modulated by the long-term cycles of AMO; stronger during positive decadal-scale phases of AMO. ENSO exerts a weaker influence on temperatures, and is only significant during positive phases of the PDO. NAO has a strong influence on Croatian winter precipitation, with negative NAO phases corresponding to higher precipitation, modulated by the longer term phases of AMO. Although weaker and less consistent, ENSO also influences Croatian winter precipitation, modulated by longer term cycles of the PDO. Both NAO and ENSO show signs of frequency-dependent correlation; NAO is influential at cycles of 8-9 and 2.4 yr in the Adriatic-Dinaric part of Croatia, while ENSO is especially influential at a 3.6 yr cycle in the Pannonian region. The influence of solar variability is apparently much weaker than that of NAO and ENSO, yet there is a remarkably coherent correlation between amplitude modulation of winter precipitation in the Pannonian region and the sunspot record.

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Section: Spectral Characteristics Of Potential Driverssupporting

confidence: 91%

The influence of regional and global climatic oscillations on Croatian climate

Bice¹,

Montanari²,

Vučetić³

et al. 2011

Intl Journal of Climatology

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“…The Elatina periods of 10-14, 22-25 and ~ 105 'years' accord with cycles in the sunspot record, which similarly displays several discrete periods between 8 and 13 years, the Hale cycle of ~ 22 years, and a longer period between 90 and 110 years (Cohen and Lintz 1974;Herman and Goldberg 1978;Sonett 1982). The longer Elatina periods of ~ 157 and ~ 314 'years' are comparable with certain solar and climatic periods for Holocene time as indicated by tree-ring studies (Williams 1983 b;Sonett 1984b).…”

Section: (A) the Solar Connectionsupporting

confidence: 54%

Solar Affinity of Sedimentary Cycles in the Late Precambrian Elatina Formation

Williams¹

1985

Aust. J. Phys.

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Climatic cyclicity is recorded by regular variations in the thickness of siltstone-fine sandstone laminae interpreted as annual deposits (varves) within the Elatina Formation, a late Precambrian ( -680 million years old) periglacial lake deposit in the Flinders Ranges, South Australia. Earlier conclusions, based on the study of limited rock outcrop, that the climatic cycles reflect solar variability are strongly supported by a complexity of periods revealed through study of drill cores of the -10 m thick varved sequence. The wealth of new data generated by the drilling program, which was CSIRO-sponsored largely because of the support of R. G. Giovanelli, has application to solar physics and solar-planetary science.

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“…Kane and Trivedi (1985) used the MEM directly on the R z series of 1749 to 1971 identifying the hidden periodicities. They listed some significant oscillations separately for the 1749-1971 and 1845-1971 epochs and found that the two segments have no common periodicity except one with a period of 9.7 yr. Their list does not include two of the three fundamental periods identified here except the one close to 11.1 yr. Quasiperiodic fluctuations with 9.7 and 11.0 or 11.1 yr. periodicity were earlier reported by Currie (1973) and Cohen and Lintz (1974). In contrast, Cole (1973) concluded that the 10.45 yr oscillation is a basic mode associated with the excitation of the new solar cycle while a 11.8 yr. period could be associated with the free-running length of the solar cycle.…”

Section: Resultsmentioning

confidence: 60%

Sunspot variability and an attempt to predict solar cycle 23 by adaptive filtering

Rangarajan

2014

Earth Planet Sp

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Long term periodicities in the sunspot cycle

Cited by 121 publications

References 8 publications

The influence of regional and global climatic oscillations on Croatian climate

The influence of regional and global climatic oscillations on Croatian climate

Solar Affinity of Sedimentary Cycles in the Late Precambrian Elatina Formation

Sunspot variability and an attempt to predict solar cycle 23 by adaptive filtering

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