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Solar cycle 17

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Solar activity from September 1933 to February 1944
Solar cycle 17
Sunspot data
Start dateSeptember 1933
End dateFebruary 1944
Duration (years)10.4
Max count198.6
Max count monthApril 1937
Min count5.8
Spotless days269
Cycle chronology
Previous cycleSolar cycle 16 (1923–1933)
Next cycleSolar cycle 18 (1944–1954)

Solar cycle 17 was the seventeenth solar cycle since 1755, when extensive 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 198.6 (April 1937), and the starting minimum was 5.8. During the minimum transit from solar cycle 17 to 18, there were a total of 269 days with no sunspots.

History

1938

Main article: January 1938 geomagnetic storm

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.

See also

References

  1. 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
  2. "The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
  3. SIDC Monthly Smoothed Sunspot Number. ""
  4. Spotless Days. ""
  5. Dr. Tony Phillips (11 July 2008). "What's Wrong with the Sun? (Nothing)". NASA. Archived from the original on 14 July 2008.
  6. Solaemon's Spotless Days Page. ""
  7. Storms, Solar (28 July 2017). "Space Weather Newspaper Archives". www.solarstorms.org.
Solar cycles
18th century
1740–1759
1760–1779
1780–1799
19th century
1800–1819
1820–1839
1840–1859
1860–1879
1880–1899
20th century
1900–1919
1920–1939
1940–1959
1960–1979
1980–1999
21st century
2000–2019
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