Solar cycle 18
| Solar cycle 18 |
|---|
| Sunspot Data |
|---|
| Start date |
February 1944 |
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| End date |
April 1954 |
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| Duration (years) |
10.2 |
|---|
| Max count |
151.8 |
|---|
| Max count month |
May 1947 |
|---|
| Min count |
3.4 |
|---|
| Spotless days |
446 |
|---|
| Cycle chronology |
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| Previous cycle |
Solar cycle 17 (1933-1944) |
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| Next cycle |
Solar cycle 19 (1954-1964) |
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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
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