No evidence for absence of solar dynamo synchronization

TL;DR

This study analyzes millennial cosmogenic radionuclide data to investigate whether the solar dynamo is synchronized by planetary tidal forces, finding evidence supporting a stable 11.07-year cycle linked to Venus-Earth-Jupiter spring tides.

Contribution

It provides a comprehensive analysis of radionuclide data supporting the hypothesis of planetary tidal synchronization of the solar dynamo, challenging previous claims of absence.

Findings

Radionuclide data show a stable 11.07-year solar cycle.

Evidence suggests synchronization by Venus-Earth-Jupiter spring tides.

Supports the planetary tidal synchronization hypothesis.

Abstract

Context: The old question of whether the solar dynamo is synchronized by the tidal forces of the orbiting planets has recently received renewed interest, both from the viewpoint of historical data analysis and in terms of theoretical and numerical modelling. Aims: We aim to contribute to the solution of this longstanding puzzle by analyzing cosmogenic radionuclide data from the last millennium. Methods: We reconsider a recent time-series of $^{14}$C-inferred sunspot data and compare the resulting cycle minima and maxima with the corresponding conventional series down to 1610 A.D., enhanced by Schove's data before that time. Results: We find that, despite recent claims to the contrary, the $^{14}$C-inferred sunspot data are well compatible with a synchronized solar dynamo, exhibiting a relatively phase-stable period of 11.07 years, which points to a synchronizing role of the spring tides of the Venus-Earth-Jupiter system.