Solar biorhythm

As the Sun's activity varies over each 11-year solar cycle – from periods of high activity (solar maxima) to low activity (solar minima) – so the Sun's oscillations, which are due to sound waves in the Sun's interior, increase and decrease in frequency. The oscillations therefore track and probe the Sun's active biorhythm.
As the Sun's activity varies over each 11-year solar cycle – from periods of high activity (solar maxima) to low activity (solar minima) – so the Sun's oscillations, which are due to sound waves in the Sun's interior, increase and decrease in frequency. The oscillations therefore track and probe the Sun's active biorhythm.
W. J. Chaplin
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Attribution (CC BY 4.0)