Solar cycle 18

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 observed during the solar cycle was 218.7 (May 1947), and the starting minimum was 12.9.[3] During the minimum transit from solar cycle 18 to 19, there were a total of 446 days with no sunspots.[4][5][6]

Solar cycle 18
Sunspot data
Start dateFebruary 1944
End dateApril 1954
Duration (years)10.2
Max count218.7
Max count monthMay 1947
Min count12.9
Spotless days446
Cycle chronology
Previous cycleSolar cycle 17 (1933–1944)
Next cycleSolar cycle 19 (1954–1964)

Cycle 18 was characterized 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
  1. Kane, R.P. (2002), "Some Implications Using the Group Sunspot Number Reconstruction", Solar Physics, 205 (2): 383–401, Bibcode:2002SoPh..205..383K, doi:10.1023/A:1014296529097, S2CID 118144552
  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. Dr. Tony Phillips (11 July 2008). "What's Wrong with the Sun? (Nothing)". NASA. Archived from the original on 14 July 2008.
  6. Solaemon's Spotless Days Page. ""
  7. 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.
  8. Petersen, Edward (2012). Single Event Effects in Aerospace. Wiley. p. 20. ISBN 978-1118084304.


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