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Enlace: http://www.exploratorium.edu/solarmax/index.html

Descripción: Solar max: The period in the solar cycle during which the number of sunspots is greatest.
Exploratorium. The museum of science, art and human perception.
«Scientists became aware that the sun went through cycles and changes by observing sunspots, the darker, relatively cooler areas of the sun. The number of sunspots can be an indication of the degree of solar activity. The average number of visible sunspots varies over time, increasing and decreasing on a regular cycle of between 9.5 to 11 years, on average about 10.8 years. An amateur astronomer, Heinrich Schwabe, was the first to note this cycle in 1843.»