| Cycle |
Started |
Finished |
Duration (years) |
Maximum (monthly SSN (Smoothed Sunspot Number)) |
Minimum (monthly SSN; end of cycle) |
Spotless Days (end of cycle) |
| Solar cycle 1 Solar cycle 1 is the first solar cycle since recording of solar sunspot activity began. The solar cycle lasted 11.3 years, beginning in March 1755 and ending in June 1766. The maximum smoothed sunspot number observed during the solar cycle was 86.5, and the minimum was 11.2.-References:...
|
March 1755 |
June 1766 |
11.3 |
86.5 |
11.2 |
|
| Solar cycle 2 Solar cycle 2 is the second solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 9 years, beginning in June 1766 and ending in June 1775. The maximum smoothed sunspot number observed during the solar cycle was 115.8, and the minimum was 7.2.-References:...
|
June 1766 |
June 1775 |
9.0 |
115.8 |
7.2 |
|
| Solar cycle 3 Solar cycle 3 is the third solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 9.3 years, beginning in June 1775 and ending in September 1784. The maximum smoothed sunspot number observed during the solar cycle was 158.5, and the minimum was...
|
June 1775 |
September 1784 |
9.3 |
158.5 |
9.5 |
|
| Solar cycle 4 Solar cycle 4 is the fourth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 13.7 years, beginning in September 1784 and ending in May 1798...
|
September 1784 |
May 1798 |
13.7 |
141.1 |
3.2 |
|
| Solar cycle 5 Solar cycle 5 is the fifth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 12.6 years, beginning in May 1798 and ending in December 1810. The maximum smoothed sunspot number observed during the solar cycle was 49.2, and the minimum was...
|
May 1798 |
December 1810 |
12.6 |
49.2 |
0.0 |
|
| Solar cycle 6 Solar cycle 6 is the sixth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 12.4 years, beginning in December 1810 and ending in May 1823. The maximum smoothed sunspot number observed during the solar cycle was 48.7, and the minimum was 0.1.-References:...
|
December 1810 |
May 1823 |
12.4 |
48.7 |
0.1 |
|
| Solar cycle 7 Solar cycle 7 is the seventh solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.5 years, beginning in May 1823 and ending in November 1833. The maximum smoothed sunspot number observed during the solar cycle was 71.5, and the minimum was...
|
May 1823 |
November 1833 |
10.5 |
71.5 |
7.3 |
|
| Solar cycle 8 Solar cycle 8 is the eighth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 9.8 years, beginning in November 1833 and ending in July 1843. The maximum smoothed sunspot number observed during the solar cycle was 146.9, and the minimum was...
|
November 1833 |
July 1843 |
9.8 |
146.9 |
10.6 |
|
| Solar cycle 9 Solar cycle 9 is the ninth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 12.4 years, beginning in July 1843 and ending in December 1855. The maximum smoothed sunspot number observed during the solar cycle was 131.9, and the minimum was 3.2...
|
July 1843 |
December 1855 |
12.4 |
131.9 |
3.2 |
~654 |
| Solar cycle 10 Solar cycle 10 is the tenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 11.3 years, beginning in December 1855 and ending in March 1867. The maximum smoothed sunspot number observed during the solar cycle was 97.3, and the minimum was 5.2...
|
December 1855 |
March 1867 |
11.3 |
97.3 |
5.2 |
~406 |
| Solar cycle 11 Solar cycle 11 is the eleventh solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 11.8 years, beginning in March 1867 and ending in December 1878. The maximum smoothed sunspot number observed during the solar cycle was 140.3, and the minimum was 2.2...
|
March 1867 |
December 1878 |
11.8 |
140.3 |
2.2 |
~1028 |
| Solar cycle 12 Solar cycle 12 is the twelfth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 11.3 years, beginning in December 1878 and ending in March 1890. The maximum smoothed sunspot number observed during the solar cycle was 74.6, and the minimum was 5...
|
December 1878 |
March 1890 |
11.3 |
74.6 |
5.0 |
~736 |
| Solar cycle 13 Solar cycle 13 is the thirteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 11.9 years, beginning in March 1890 and ending in February 1902. The maximum smoothed sunspot number observed during the solar cycle was 87.9, and the minimum was 2.7...
|
March 1890 |
February 1902 |
11.9 |
87.9 (Jan 1894) |
2.7 |
~938 |
| Solar cycle 14 Solar cycle 14 is the fourteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 11.5 years, beginning in February 1902 and ending in August 1913. The maximum smoothed sunspot number observed during the solar cycle was 64.2, and the minimum was 1.5...
|
February 1902 |
August 1913 |
11.5 |
64.2 (Feb 1906) |
1.5 |
~1019 |
| Solar cycle 15 Solar cycle 15 is the fifteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10 years, beginning in August 1913 and ending in August 1923. The maximum smoothed sunspot number observed during the solar cycle was 105.4, and the minimum was 5.6...
|
August 1913 |
August 1923 |
10.0 |
105.4 (Aug 1917) |
5.6 |
534 |
| Solar cycle 16 Solar cycle 16 is the sixteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.1 years, beginning in August 1923 and ending in September 1933. The maximum smoothed sunspot number observed during the solar cycle was 78.1, and the minimum was 3.5...
|
August 1923 |
September 1933 |
10.1 |
78.1 (Apr 1928) |
3.5 |
568 |
| Solar cycle 17 Solar cycle 17 is the seventeenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.4 years, beginning in September 1933 and ending in February 1944. The maximum smoothed sunspot number observed during the solar cycle was 119.2, and the minimum was...
|
September 1933 |
February 1944 |
10.4 |
119.2 (Apr 1937) |
7.7 |
269 |
| Solar cycle 18 Solar cycle 18 is the eighteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.2 years, beginning in February 1944 and ending in April 1954. The maximum smoothed sunspot number observed during the solar cycle was 151.8, and the minimum was 3.4...
|
February 1944 |
April 1954 |
10.2 |
151.8 (May 1947) |
3.4 |
446 |
| Solar cycle 19 Solar cycle 19 is the nineteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.5 years, beginning in April 1954 and ending in October 1964....
|
April 1954 |
October 1964 |
10.5 |
201.3 (Mar 1958) |
9.6 |
227 |
| Solar cycle 20 Solar cycle 20 is the twentieth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 11.7 years, beginning in October 1964 and ending in June 1976. The maximum smoothed sunspot number observed during the solar cycle was 110.6, and the minimum was 12.2...
|
October 1964 |
June 1976 |
11.7 |
110.6 (Nov 1968) |
12.2 |
272 |
| Solar cycle 21 Solar cycle 21 is the 21st solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.3 years, beginning in June 1976 and ending in September 1986. The maximum smoothed sunspot number observed during the solar cycle was 164.5, and the minimum was 12.3...
|
June 1976 |
September 1986 |
10.3 |
164.5 (Dec 1979) |
12.3 |
273 |
| Solar cycle 22 Solar cycle 22 is the 22nd solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 9.7 years, beginning in September 1986 and ending in May 1996. The maximum smoothed sunspot number observed during the solar cycle was 158.5, and the minimum was 8...
|
September 1986 |
May 1996 |
9.7 |
158.5 (Jul 1989) |
8.0 |
309 |
| Solar cycle 23 Solar cycle 23 is the 23rd solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 12.6 years, beginning in May 1996 and ending in December 2008. The maximum smoothed sunspot number observed during the solar cycle was 120.8, and the minimum was 1.7...
|
May 1996 |
December 2008 |
12.6 |
120.8 (Mar 2000) |
1.7 |
820 (through Jan 15, 2011) |
| Solar cycle 24 Solar Cycle 24 is the 24th solar cycle since 1755, when recording of solar sunspot activity began. It is the current solar cycle, and began on . The cycle continues to fall below predictions and is currently exhibiting 50% lower sunspot activity than predicted in May 2009.-Predictions:It is...
|
December 2008 |
|
|
|
|
| Mean |
|
|
10.6 |
114.1 |
5.8 |
