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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.
Diese Geschichte stammt aus der Issue 117-Ausgabe von All About Space.
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Diese Geschichte stammt aus der Issue 117-Ausgabe von All About Space.
Starten Sie Ihre 7-tägige kostenlose Testversion von Magzter GOLD, um auf Tausende kuratierte Premium-Storys sowie über 8.000 Zeitschriften und Zeitungen zuzugreifen.
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CELESTRON STARSENSE EXPLORER DX 102AZ
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MARS HELICOPTER PHONES HOME AFTER A 63-DAY SILENCE
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TIME APPEARED TO MOVE FIVE TIMES SLOWER IN THE FIRST BILLION YEARS AFTER THE BIG BANG
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