Solar cycle 1
Solar cycle 1 | |
---|---|
Sunspot data | |
Start date | February 1755 |
End date | June 1766 |
Duration (years) | 11.3 |
Max count | 144.1 |
Max count month | June 1761 |
Min count | 14.0 |
Cycle chronology | |
Next cycle | Solar cycle 2 (1766–1775) |
Solar cycle 1 was the first solar cycle during which extensive recording of solar sunspot activity took place.[1][2] The solar cycle lasted 11.3 years, beginning in February 1755 and ending in June 1766. The maximum smoothed sunspot number observed during the solar cycle was 144.1 (June 1761), and the starting minimum was 14.0.[3]
Solar cycle 1 was discovered by Johann Rudolph Wolf who, inspired by the discovery of the solar cycle by Heinrich Schwabe in 1843, collected all available sunspot observations going back to the first telescopic observations by Galileo. He was able to improve Schwabe's estimate of the mean length of the cycle from about a decade to 11.11 years.[4] However, he could not find enough observations before 1755 to reliably identify cycles, hence the 1755–1766 cycle is conventionally numbered as cycle 1. Wolf published his results in 1852.[5]
See also
References
- ^ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics. 205 (2): 383–401. Bibcode:2002SoPh..205..383K. doi:10.1023/A:1014296529097. S2CID 118144552.
- ^ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
- ^ "SIDC Monthly Smoothed Sunspot Number". sidc.oma.be.
- ^ Clark, Stuart G. (2007). The Sun Kings. Princeton University Press. p. 73. ISBN 978-0691126609.
- ^ Letellier, Christophe (2013). Chaos in Nature. World Scientific. pp. 344–346. ISBN 978-9814374422.
- v
- t
- e
- Solar cycle 1 (1755 February – 1766 June)
- Solar cycle 2 (1766 June – 1775 June)
- Solar cycle 3 (1775 June – 1784 September)
- Solar cycle 4 (1784 September – 1798 April)
- Solar cycle 5 (1798 April – 1810 August)
- Solar cycle 6 (1810 August – 1823 May)
- Solar cycle 7 (1823 May – 1833 November)
- Solar cycle 8 (1833 November – 1843 July)
- Solar cycle 9 (1843 July – 1855 December)
- Solar cycle 10 (1855 December – 1867 March)
- Solar cycle 11 (1867 March – 1878 December)
- Solar cycle 12 (1878 December – 1890 March)
- Solar cycle 13 (1890 March – 1902 January)
- Solar cycle 14 (1902 January – 1913 July)
- Solar cycle 15 (1913 July – 1923 August)
- Solar cycle 16 (1923 August – 1933 September)
- Solar cycle 17 (1933 September – 1944 February)
- Solar cycle 18 (1944 February – 1954 April)
- Solar cycle 19 (1954 April – 1964 October)
- Solar cycle 20 (1964 October – 1976 March)
- Solar cycle 21 (1976 March – 1986 September)
- Solar cycle 22 (1986 September – 1996 August)
- Solar cycle 23 (1996 August – 2008 December)
- Solar cycle 24 (2008 December – 2019 December)
- Solar cycle 25 (2019 December - present)