1947 sunspot
(largest sunspot ever recorded)
A 1947 sunspot in March and April was the largest
ever recorded, records going back to the 1700s. The year
had a number of geomagnetic storms.
(solar,magnetism,event)
Further reading:
https://en.wikipedia.org/wiki/Solar_cycle_18
https://ui.adsabs.harvard.edu/abs/1947PASP...59..109H/abstract
https://ui.adsabs.harvard.edu/abs/1948PASP...60...98N/abstract
https://spaceweather.com/sunspots/history.html
Index