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
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
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