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The international sunspot number series extends back to 1700 with annual values while daily values exist only since 1818. Since 1 July 2015 a revised and updated international sunspot number series has been made available. [5] The biggest difference is an overall increase by a factor of 1.6 to the entire series. Traditionally, a scaling of 0.6 ...
The smoothed sunspot number rose again towards this second peak over the last five months of 2016 and surpassed the level of the first peak (66.9 in February 2012). Many cycles are double peaked but this is the first in which the second peak in sunspot number was larger than the first. This was over five years into cycle 24.
The maximum smoothed sunspot number observed during the solar cycle was 285.0, in March 1958 (the highest on record [3]), and the starting minimum was 5.1. [4] During the minimum transit from solar cycle 19 to 20, there were a total of 227 days with no sunspots. This was the lowest number since 1850. [5] [6] [7]
Solar cycle 21 was the 21st solar cycle since 1755, when extensive recording of solar sunspot activity began. [1] [2] The solar cycle lasted 10.5 years, beginning in March 1976 and ending in September 1986. The maximum smoothed sunspot number observed during the solar cycle was 232.9, in December 1979, and the starting minimum was 17.8. [3]
NASA Solar Cycle 24 Sunspot Number Prediction. Solar cycle 24 is the most recently completed solar cycle, the 24th since 1755, when extensive recording of solar sunspot activity began. [1] [2] It began in December 2008 with a minimum smoothed sunspot number of 2.2, [3] [failed verification] and ended in December 2019. [4] Activity was minimal ...
Solar cycle 22 was the 22nd solar cycle since 1755, when extensive recording of solar sunspot activity began. [1] [2] The solar cycle lasted 9.9 years, beginning in September 1986 and ending in August 1996. The maximum smoothed sunspot number observed during the solar cycle was 212.5 (November 1989), and the starting minimum was 13.5. [3]
The maximum smoothed sunspot number observed during the solar cycle was 180.3 (November 2001), and the starting minimum was 11.2. [4] During the minimum transit from solar cycle 23 to 24, there were a total of 817 days with no sunspots. [5] [6] [7] Compared to the last several solar cycles, it was fairly average in terms of activity.
Solar cycle 20 was the twentieth solar cycle since 1755, when extensive recording of solar sunspot activity began. [2] [3] The solar cycle lasted 11.4 years, beginning in October 1964 and ending in March 1976. The maximum smoothed sunspot number observed during the solar cycle was 156.6 (November 1968), and the starting minimum was 14.3. [4]