Solar cycle 14

Solar cycle 14
The Sun, with some sunspots visible, during solar cycle 14 (1904).
Sunspot Data
Start date	February 1902
End date	August 1913
Duration (years)	11.5
Max count	64.2
Max count month	February 1906
Min count	1.5
Spotless days	1019
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).

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 February 1902 and ending in August 1913. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 64.2, in February 1906 (the lowest since the Dalton Minimum), and the minimum was 1.5.^[3] There were a total of approximately 1019 days with no sunspots during this cycle (the second highest recorded of any cycle to date).^[4][5][6]

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

See also

• Solar variation
• List of solar cycles

References

1. Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
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. What's Wrong with the Sun? (Nothing) more information: Spotless Days. ""
6. Solaemon's Spotless Days Page. ""
7. http://www.solarstorms.org/SRefStorms.html