Solar cycle 17
Solar activity from September 1933 to February 1944
| Solar cycle 17 | |
|---|---|
| Sunspot data | |
| Start date | September 1933 |
| End date | February 1944 |
| Duration (years) | 10.4 |
| Max count | 198.6 |
| Max count month | April 1937 |
| Min count | 5.8 |
| 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 observed during the solar cycle was 198.6 (April 1937), and the starting minimum was 5.8.[3] During the minimum transit from solar cycle 17 to 18, there were a total of 269 days with no sunspots.[4][5][6]
History
1938
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]
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. "[1]"
- ^ Spotless Days. "[2]"
- ^ Dr. Tony Phillips (11 July 2008). "What's Wrong with the Sun? (Nothing)". NASA. Archived from the original on 14 July 2008.
- ^ Solaemon's Spotless Days Page. "[3]"
- ^ Storms, Solar (28 July 2017). "Space Weather Newspaper Archives". www.solarstorms.org.
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Solar cycles
- 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)
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