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La "sonnolenza" del Sole stuzzica gli esperti. Un’attività minima che stimola la curiosità del mondo scientifico.
Il numero di macchie solari dall’inizio del ciclo di 11 anni, nel 2008, è molto basso rispetto alla media degli ultimi 250 anni. Nel 2009 vi sono stati 266 giorni senza alcuna macchia solare; nel 2012 ve ne sono state solo 67, la metà della media.
Sembra azzardato, concordano gli specialisti, fare un nesso con il "Minimo di Maunder", che coincise dal 1645 al 1715 con un'attività solare molto bassa marcata da inverni molto freddi, la "piccola era glaciale".
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