O número de manchas solares aumenta e diminui em intervalos regulares de tempo, num ciclo que dura aproximadamente 11 anos e é chamado de ciclo de manchas solares. A duração exata de cada ciclo pode variar. Pode ser curto com 8 anos de duração ou mais longo chegando até a 14 anos, mas o número de manchas solares sempre aumenta com o passar do tempo e depois cai novamente. No vídeo acima feito pela NASA o ciclo solar é explicado em detalhes, e assim se pode entender um pouco mais sobre esse ciclo que influencia a vida na Terra de forma direta.
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