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This is an activity about the periodicity of the solar cycle. Learners will calculate the number of M-class solar flares as a percentage of the total number of X-ray solar flares and graph these results as a function of time. When compared to a graph of the number of sunspots as a function of time, learners make conclusions about the period of the solar cycle. This activity uses data from the Geostationary Operational Environmental Satellite (GOES).