Solar cycle 15
| Solar cycle 15 | |
|---|---|
Sunspots recorded during solar cycle 15 (23 January 1923).
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| Sunspot Data | |
| Start date | August 1913 |
| End date | August 1923 |
| Duration (years) | 10.0 |
| Max count | 105.4 |
| Max count month | August 1917 |
| Min count | 5.6 |
| Spotless days | 534 |
| Cycle chronology | |
| Previous cycle | Solar cycle 14 (1902-1913) |
| Next cycle | Solar cycle 16 (1923-1933) |
Solar cycle 15 was the fifteenth solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 10 years, beginning in August 1913 and ending in August 1923. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 105.4 (August 1917), and the minimum was 5.6.[3] There were a total of 534 days with no sunspots during this cycle.[4][5][6] A major geomagnetic storm during 13–15 May 1921 caused damage in communication systems and aurora displays in much of the eastern United States. [7]
Geomagnetic storms in March 1918, August 1919, October 1919, and March 1920 affected telegraph lines, while a solar flare on 13 May 1921 also affected rail signal and switching equipment, in what was known as the "New York Railroad Storm."[8]
See also
References
- ↑ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ SIDC Monthly Smoothed Sunspot Number. "[1]"
- ↑ Spotless Days. "[2]"
- ↑ What's Wrong with the Sun? (Nothing) more information: Spotless Days. "[3]"
- ↑ Solaemon's Spotless Days Page. "[4]"
- ↑ http://www.solarstorms.org/SS1921.html
- ↑ http://www.solarstorms.org/SRefStorms.html
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