Solar cycle 15

Solar cycle 15

Solar cycle 15 was the fifteenth solar cycle since 1755, when 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, 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 occurred on May 13, 1921 causing damage in communication systems and aurora displays at Zenith in California [7]

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