Solar cycle 19
Solar cycle 19 was the nineteenth solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.5 years, beginning in April 1954 and ending in October 1964. The International Geophysical Year occurred at the peak of this solar cycle.
The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 201.3, and the minimum was 9.6.
Intense red aurora display frightened people in Europe on 11 February 1958 and were visible from many US cities as far South as the 40th parallel. This geomagnetic storm caused a radio blackout over North America.
Aurora displays were visible over New York, on 13 November 1960 and 1 October 1961.
- 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. ""
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