Solar cycle 17

Solar cycle 17
Sunspot Data
Start date	September 1933
End date	February 1944
Duration (years)	10.4
Max count	119.2
Max count month	April 1937
Min count	7.7
Spotless days	269
Cycle chronology
Previous cycle	Solar cycle 16 (1923-1933)
Next cycle	Solar cycle 18 (1944-1954)

Solar cycle 17 was the seventeenth solar cycle since 1755, when extensive recording of solar sunspot activity began.^[1]^[2] The solar cycle lasted 10.4 years, beginning in September 1933 and ending in February 1944. 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.^[3] There were a total of 269 days with no sunspots during this cycle.^[4]^[5]^[6] A great aurora display was seen all over Europe on 25 January 1938, as far south as Portugal and Sicily, frightening many people. Some thought that the red glow indicated large fires, while others linked it to the Fátima prophecies. An aurora was visible over New York on 3 April 1940.^[7]

References

↑ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
↑ "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
↑ SIDC Monthly Smoothed Sunspot Number. ""
↑ Spotless Days. ""
↑ What's Wrong with the Sun? (Nothing) more information: Spotless Days. ""
↑ Solaemon's Spotless Days Page. ""
↑ http://www.solarstorms.org/SRefStorms.html

Solar cycles

18th century	Solar cycle 1 (1755 March – 1766 June) Solar cycle 2 (1766 June – 1775 June) Solar cycle 3 (1775 June – 1784 September) Solar cycle 4 (1784 September – 1798 May) Solar cycle 5 (1798 May – 1810 December)

19th century	Solar cycle 6 (1810 December – 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 February)

20th century	Solar cycle 14 (1902 February – 1913 August) Solar cycle 15 (1913 August – 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 June) Solar cycle 21 (1976 June – 1986 September) Solar cycle 22 (1986 September – 1996 May) Solar cycle 23 (1996 May – 2008 January)

21st century	Solar cycle 24 (2008 January – present)

List of solar cycles

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Solar cycle 17

See also

References