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The Sun has one particular rhythm, lasting approximately 11 years, in which its polar magnetic field flips polarity. Sunspots serve as an indicator of this change. Indeed, it’s often known as ‘the sunspot cycle’.
Although sunspots themselves were first observed by Galileo, Christoph Scheiner and others from 1609 onwards, the cyclical nature of their appearance and disappearance was first noted in 1775 by Danish astronomer Christian Horrebow. It was then rediscovered in 1843 by Heinrich Schwabe. In 1848, Swiss astronomer Rudolf Wolf used Schwabe and others’ results, as well as performing his own observations, to calculate the 11-year cycle and a mathematical method to count the number of sunspots. This so-called ‘Wolf number’ remains in use today.
Esta historia es de la edición Issue 117 de All About Space.
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Esta historia es de la edición Issue 117 de All About Space.
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