Solar prominences during solar cycle 14 (21 August 1909).
Solar cycle 14 was the fourteenth solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 11.5 years, beginning in February 1902 and ending in August 1913. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 64.2, in February 1906 (the lowest since the Dalton Minimum), and the minimum was 1.5. There were a total of approximately 1019 days with no sunspots during this cycle (the second highest recorded of any cycle to date).
Geomagnetic storms in November 1903, March 1905, and September 1909 affected telegraph lines.