The maximum smoothed sunspot number ( monthly number of sunspots averaged over a twelve-month period ) observed during the solar cycle was 98.0 ( February 1860 ), and the minimum was 5.2.
22.
The maximum smoothed sunspot number ( monthly number of sunspots averaged over a twelve-month period ) observed during the solar cycle was 119.2 ( April 1937 ), and the minimum was 7.7.
23.
The maximum smoothed sunspot number ( monthly number of sunspots averaged over a twelve-month period ) observed during the solar cycle was 74.6 ( December 1883 ), and the minimum was 5.
24.
The maximum smoothed sunspot number ( monthly number of sunspots averaged over a twelve-month period ) observed during the solar cycle was 105.4 ( August 1917 ), and the minimum was 5.6.
25.
The monthly mean sunspot number in the northern solar hemisphere peaked in November 2011, while the southern hemisphere appears to have peaked in February 2014, reaching a peak monthly mean of 102.
26.
The investigations of the Maunders demonstrated a correlation between the variation in sunspot numbers and the climate of the Earth, leading to the discovery that the period of decreased solar activity during the Maunder Minimum.
27.
In an extension of this work in 1971 Muggleton showed that the regression coefficients between E-region peak electron density, N _ m ( E ), and sunspot number, R, depend on the particular solar cycle investigated.
28.
The maximum smoothed sunspot number ( monthly number of sunspots averaged over a twelve-month period ) observed during the solar cycle was 201.3, in March 1958 ( the highest on record ), and the minimum was 9.6.
29.
The maximum smoothed sunspot number ( monthly number of sunspots averaged over a twelve-month period ) observed during the solar cycle was 164.5, in December 1979 ( the second-highest peak on record ), and the minimum was 12.3.
30.
The Dalton minimum in the 400-year history of sunspot numbers, showing the low peaks for solar cycles 5 and 6 . "'Solar cycle 6 "'was the sixth solar cycle since 1755, when extensive recording of solar sunspot activity began.
