Multi-scale comparative spectral analysis of satellite total solar irradiance measurements from 2003 to 2013 reveals a planetary modulation of solar activity and its non-linear dependence on the 11-year solar cycle

摘要

Herein we adopt a multi-scale dynamical spectral analysis technique tocompare and study the dynamical evolution of the harmonic components of theoverlapping ACRIMSAT/ACRIM3, SOHO/VIRGO and SORCE/TIM total solar irradiance(TSI) records during 2003.15 to 2013.16 in solar cycles 23 and 24. The threeTSI time series present highly correlated patterns. Significant power spectralpeaks are common to these records and are observed at the following periods:0.070 year, 0.097 year, 0.20 year, 0.25 year, 0.30-0.34 year, 0.39 year. Lesscertain spectral peaks occur at about 0.55 year, 0.60-0.65 year and 0.7-0.9year. Four main frequency periods at 24.8 days (0.068 year), 27.3 days (0.075year), at 34-35 days (0.093-0.096 year) and 36-38 days (0.099-0.104 year)characterize the solar rotation cycle. The amplitude of these oscillations, inparticular of those with periods larger than 0.5 year, appears to be modulatedby the 11-year solar cycle. Similar harmonics have been found in other solarindices. The observed periodicities are found highly coherent with the spring,orbital and synodic periods of Mercury, Venus, Earth and Jupiter. We concludethat solar activity is likely modulated by planetary gravitational andelectromagnetic forces acting on the sun. The strength of the sun's response toplanetary forcing depends non-linearly on the state of internal solar dynamics:planetary-sun coupling effects are enhanced during solar activity maxima andattenuated during minima.