Sixfold enhancement of solar pulsations: 1974–2018
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Abstract
Doppler observations of the Sun performed at the Crimean Astrophysical Observatory from 1974 through 2018 show that our star pulsates with the two periods, 9600.606(12) s and 9597.924(13) s. But while the first pulsation was observed during years of the enhanced amplitude only, the second one – over nearly 45 years, with a sixfold amplitude enhancement in 2018 (as compared to the average amplitude of the total 45-year dataset). The characteristic timescale of the amplitude variations, 12(1) years, coincides within the error limits with both the length of the Schwabe 11-year cycle and the sidereal period of Jupiter, 12 years. It also seems puzzling that (a) both periods happened to be near the 9th daily harmonic of the mean solar day, and (b) the beating timescale of these two periods, 398 days, coincides within the error limits with the orbital period of Jupiter, 399 days (synodic). Several evidences for a cosmic nature of the first pulsation are presented, but the true physical cause of both pulsations is not yet understood.
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