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Regular Research Article 25 Nov 2013
2Duke University, Durham, NC 27708, USA
Received: 28 Sep 2013 – Revised: 24 Oct 2013 – Accepted: 30 Oct 2013 – Published: 25 Nov 2013 Abstract. Herein we adopt a multiscale dynamical spectral analysis technique to
compare and study the dynamical evolution of the harmonic components of the
overlapping ACRIMSAT/ACRIM3 (Active Cavity Radiometer Irradiance Monitor
Satellite/Active Cavity Radiometer Irradiance Monitor 3), SOHO/VIRGO
(Solar and Heliopheric Observatory/Variability of solar Irradiance and
Gravity Oscillations), and SORCE/TIM (Solar Radiation and Climate
Experiment/Total Irradiance Monitor) total solar irradiance
(TSI) records during 2003.15 to 2013.16 in solar cycles 23 and 24. The three
TSI time series present highly correlated patterns.
Significant power spectral peaks are common to these records and are observed
at the following periods: ~ 0.070 yr, ~ 0.097 yr, ~ 0.20 yr,
~ 0.25 yr, ~ 0.30–0.34 yr, and ~ 0.39 yr. Less certain spectral
peaks occur at about 0.55 yr, 0.60–0.65 yr and 0.7–0.9 yr. Four main
frequency periods at ~ 4.8 days (~ 0.068 yr), ~ 27.3 days
(~ 0.075 yr), at ~ 34–35 days (~ 0.093–0.096 yr), and
~ 36–38 days (~ 0.099–0.104 yr) characterize the solar rotation
cycle. The amplitude of these oscillations, in particular of those with
periods larger than 0.5 yr, appears to be modulated by the ~ 11 yr
solar cycle. Similar harmonics have been found in other solar indices. The
observed periodicities are found highly coherent with the spring, orbital and
synodic periods of Mercury, Venus, Earth and Jupiter. We conclude that solar
activity is likely modulated by planetary gravitational and electromagnetic
forces acting on the Sun. The strength of the Sun’s
response to planetary forcing depends nonlinearly on the state of internal
solar dynamics; planetary–Sun coupling effects are enhanced during solar
activity maxima and attenuated during minima.
Citation: Scafetta, N. and Willson, R. C.: 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, Pattern Recogn. Phys., 1, 123-133, doi:10.5194/prp-1-123-2013, 2013.
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