Multiscale comparative spectral analysis of satellite total solar irradiance measurements from 2003 to 2013 reveals a planetary modulation of solar activity and its nonlinear dependence on the 11 yr solar cycle

Scafetta, Nicola; Willson, R. C.

doi:10.5194/prp-1-123-2013

Cited by 16 publications

(11 citation statements)

References 36 publications

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“…Recently, Scafetta et al (2013) (273.9-310.5 days). As a result, all the periodic variations found in this article were obtained by using different solar activity indicators and different methods.…”

Section: Consistency With Earlier Resultsmentioning

confidence: 99%

Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986

et al. 2014

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In this study, we used two methods to investigate the periodic behavior of sunspot counts in four categories for the time period January 1986-October 2013. These categories include the counts from simple (A and B), medium (C), large (D, E, and F), and final (H) sunspot groups. We used: i) the Multi-taper Method with red noise approximation, and ii) the Morlet wavelet transform for periodicity analysis. Our main findings are: (1) the solar rotation periodicity of about 25 to 37 days, which is of obvious significance, is found in all groups with at least a 95% significance level; (2) the periodic behavior of a cycle is strongly related to its amplitude and group distribution during the cycle; (3) the appearance of periods follow the amplitude of the investigated solar cycles, (4) meaningful periods do not appear during the minimum phases of the investigated cycles. We would like to underline that the cyclic behavior of all categories is not completely the same; there are some differences between these groups. This result can provide a clue for the better understanding of solar cycles.

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Section: Consistency With Earlier Resultsmentioning

confidence: 99%

Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986

et al. 2014

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“…In addition to the well-known 11-year solar cycle, solar activity varies on many shorter and longer timescales. For example, periodicities shorter than a year and of about two years are found in many solar activity indices (Rieger et al, 1984;Lean and Brueckner, 1989;Pap, Bouwer, Tobiska, 1990;Bai and Sturrock, 1991;Bouwer, 1992;Richardson et al, 1994;Krivova and Solanki, 2002;Özgüc, Atac, and Rybák, 2003;Kane, 2003;Bai, 2003;Obridko and Shelting, 2000;Obridko and Shelting, 2007;Chowdhury, Khan, and Ray, 2009;Scafetta and Willson, 2013;Kilcik et al, 2014;Chowdhury et al, 2016;and references therein). Studies of similar variations in the solar rotation data may help us to better understand the physical processes responsible for the solar variability.…”

Section: Introductionmentioning

confidence: 99%

Short-Term Variations in the Equatorial Rotation Rate of Sunspot Groups

Javaraiah¹,

Bertello

2016

Sol Phys

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We have detected several periodicities in the solar equatorial rotation rate of sunspot groups in the Greenwich Photoheliographic Results (GPR) during the period 1931-1976, the Solar Optical Observing Network (SOON) during the period 1977-2014, and the Debrecen Photoheliographic Data (DPD) during the period 1974-2014. Our results suggest a ~250-day period in the equatorial rotation rate determined from both the Mt. Wilson Doppler-velocity data and the sunspot-group data during 1986-2007. However, a wavelet analysis reveals that this periodicity appears mostly around 1991 in the velocity data, while it is present in most of the solar cycles covered by the sunspot-group data, mainly near the minimum epochs of the solar cycles. We also found the signature of a period of ~1.4 years period in the velocity data during 1990-1995, and in the equatorial rotation rate of sunspot groups mostly around the year 1956. The equatorial rotation rate of sunspot groups reveals a strong ~1.6-year periodicity around 1933 and 1955 and a weaker one around 1976, and a strong ~1.8-year periodicity around 1943. Our analysis also suggests periodicities of ~5 years, ~7 years, and ~17 years as well as some other short-term periodicities. However, short-term periodicities are mostly present at the time of solar minima. Hence, short-term periodicities cannot be confirmed because of the larger uncertainty in the data.Comment: 20 pages, 10 figures, to be published in Solar Physic

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“…These observations indicate that in addition to resonance between the orbital and rotation periods between individual planets and the Sun, we may hypothesise that there is also resonance between the solar rotation rates at various latitudes reinforcing the effect. If there is an effect of this resonance on solar activity levels, we would expect to see evidence of it in accurate TSI measurement, such as the strong peaks seen at periods around 25-27 days and 33-35 days in spectrographic analysis of TSI (Scafetta and Willson, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Near the poles, the period of rotation is around 35 days. These periods relate to variation in total solar irradiance (TSI) (Scafetta and Willson, 2013).…”

Section: Differential Solar Rotation Rates Relating To Planetary Motionmentioning

confidence: 99%

Apparent relations between planetary spin, orbit, and solar differential rotation

Tattersall

2013

Pattern Recogn. Phys.

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Abstract.A correlation is found between changes in Earth's length of day [LOD] and the spatio-temporal disposition of the planetary masses in the solar system, characterised by the z axis displacement of the centre of mass of the solar system [CMSS] with respect to the solar equatorial plane smoothed over a bi-decadal period. To test whether this apparent relation is coincidental, other planetary axial rotation rates and orbital periods are compared, and spin-orbit relations are found. Earth's axial angular momentum moment of inertia, and internal dynamics are considered in relation to the temporal displacement between the potential stimulus and the terrestrial response. The differential rotation rate of the Sun is considered in relation to the rotational and orbital periods of the Earth-Moon system and Venus and Mercury, and harmonic ratios are found. These suggest a physical coupling between the bodies of an as yet undetermined nature. Additional evidence for a resonant coupling is found in the relation of total solar irradiance (TSI) and galactic cosmic ray (GCR) measurements to the resonant harmonic periods discovered.

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Multiscale comparative spectral analysis of satellite total solar irradiance measurements from 2003 to 2013 reveals a planetary modulation of solar activity and its nonlinear dependence on the 11 yr solar cycle

Cited by 16 publications

References 36 publications

Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986

Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986

Short-Term Variations in the Equatorial Rotation Rate of Sunspot Groups

Apparent relations between planetary spin, orbit, and solar differential rotation

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