Solar cycle 18
| Solar cycle 18 | |
|---|---|
| Sunspot Data | |
| Start date | February 1944 |
| End date | April 1954 |
| Duration (years) | 10.2 |
| Max count | 151.8 |
| Max count month | May 1947 |
| Min count | 3.4 |
| Spotless days | 446 |
| Cycle chronology | |
| Previous cycle | Solar cycle 17 (1933-1944) |
| Next cycle | Solar cycle 19 (1954-1964) |
Solar cycle 18 was the eighteenth solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 10.2 years, beginning in February 1944 and ending in April 1954. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 151.8 (May 1947), and the minimum was 3.4.[3] There were a total of 446 days with no sunspots during this cycle.[4][5][6]
Cycle 18 was characterised by "giant" sunspots.[7] The recording of the 10.7 cm (2800 MHz) solar radio flux began partway during this cycle,[8] and values of the solar flux during this cycle turned out to be particularly high.[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. ""
- 1 2 Dodson, Helen W.; Hedeman, E. Ruth; Mohler, Orren C. (August 1974). "Comparison of activity in solar cycles 18, 19, and 20". Reviews of Geophysics 12 (3): 329–341. Bibcode:1974RvGSP..12..329D. doi:10.1029/RG012i003p00329.
- ↑ Petersen, Edward (2012). Single Event Effects in Aerospace. Wiley. p. 20. ISBN 1118084306.
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