# Observations have shown that at the moment the solar activity index, measured in Wolf numbers, is W = 123

September 16, 2020 | Education

| **Observations have shown that at the moment the solar activity index, measured in Wolf numbers, is W = 123, and the number of all sunspots on the Sun is f = 33. Determine the number of groups g on the solar disk, taking the factor k in the formula W = k (10g + f) equal to one**

To find the number of groups, i.e. unknown from the above formula, it is necessary to substitute the values of known quantities into the formula. We will have 123 = 1 (10g + 33). Or 123 = 10g + 33. Or 10g = 90, Hence the number of groups g = 90/10 = 9 groups.

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