Summary
We briefly discuss the existence in various aspects of solar activity of the precise periodicities of Hale cycle (22y), Gleissberg cycle (88y) and of 132y recently discovered by our group. We consider also the possible harmonics of 11y and 5.5y, and make the hypothesis that the Sun behaves as a nonlinear system forced by an oscillator having the Hale frequency. The frequencies of 1c/88y and of 1c/132y might be two subharmonics of Hale frequency. The forcing elementx inside the Sun might be identified with the torsional oscillator suggested by Bracewell.
Riassunto
In questo lavoro viene discussa l'esistenza delle periodicità del ciclo di Hale (22 anni), del ciclo di Gleissberg (88 anni) e del ciclo di 132 anni, nei diversi aspectti dell'attività solare. Si prendono in considerazione inoltre le possibili armoniche di 11 e 5.5 anni e si fa l'ipotesi che il Sole si comporti come un sistema non lineare forzato da un oscillatore che ha la frequenza di Hale. Le frequenze di 1c/88 anni e di 1c/132 anni possono essere considerate come due subarmoniche di tale ciclo. Gli elemeni forzanti all'interno del Sole possono essere identificati con l'oscillatore torsionale suggerito da Bracewell.
Резюме
Мы вкратце обсуждаем существование периодической солнечной активности: 22-летнего цикла, 888-летнего цикла и недавно обнаруженного нашей группой 132-летнего цикла. Мы также рассматриваем возможные гармоники 11-лет и 5.5-лет. Мы предполагаем, что Солнце ведет себя как нелинейная система, находящаяся под действием осциллятора с частотой Хейла. Частоты 1/88 и 1/132 могут представлять две субгармоники частоты Хейла. Силовой элемент внутри Солнца может быть индентифицирован с крутильным осциллятором, предложенным Брейсвеллом (1987).
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Attolini, M.R., Cecchini, S., Galli, M. et al. The subharmonics of the 22-year solar cycle. Il Nuovo Cimento C 13, 131–138 (1990). https://doi.org/10.1007/BF02515782
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DOI: https://doi.org/10.1007/BF02515782