Solar cycle 14

Solar cycle 14 was the fourteenth solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 11.5 years, beginning in January 1902 and ending in July 1913. The maximum smoothed sunspot number (SIDC formula) observed during the solar cycle was 107.1, in February 1906 (the lowest since the Dalton Minimum), and the starting minimum was 4.5.[3] During the minimum transit from solar cycle 14 to 15, there were a total of 1023 days with no sunspots (the second highest recorded of any cycle to date).[4][5][6]

Solar cycle 14
The Sun, with some sunspots visible, during solar cycle 14 (1904).
Sunspot data
Start date	January 1902
End date	July 1913
Duration (years)	11.5
Max count	107.1
Max count month	February 1906
Min count	4.5
Spotless days	1023
Cycle chronology
Previous cycle	Solar cycle 13 (1890–1902)
Next cycle	Solar cycle 15 (1913–1923)

Solar prominences during solar cycle 14 (21 August 1909).

Geomagnetic storms in November 1903, March 1905, and September 1909 affected telegraph lines.[7]

See also

• List of solar cycles

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
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.