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Solar cycle 18 was the eighteenth solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 10.2 years, beginning in February 1944 and ending in April 1954. The maximum smoothed sunspot number observed during the solar cycle was 218.7 (May 1947), and the starting minimum was 12.9. During the minimum transit from solar cycle 18 to 19, there were a total of 446 days with no sunspots.

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  • Cycle solaire 18 (fr)
  • 第18太陽周期 (ja)
  • Solar cycle 18 (en)
  • 第18太陽週期 (zh)
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  • Le cycle solaire 18 est le dix-huitième cycle solaire depuis 1755, date du début du suivi intensif de l'activité et des taches solaires. Il a commencé en 1944 et s'est achevé en 1954. (fr)
  • 第18太陽周期(Solar cycle 18)は、1755年に太陽黒点の活動が記録され始めてから18番目の太陽活動周期である。1944年2月から1954年4月まで10.2年続いた。太陽黒点の最大数は151.8個で、最小数は3.4個だった。合計約446日間にわたり黒点が現れなかった。 (ja)
  • 第18太陽週期是從1755年開始紀錄太陽黑子以來的第18太陽週期，這個週期開始於1944年2月，結束於1954年4月，持續了10.2年。最大平滑黑子數(超過12個月期間的黑子月平均數值)為151.8，最小的數值為3.4，在這個週期內總共約有446天沒有黑子。 (zh)
  • Solar cycle 18 was the eighteenth solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 10.2 years, beginning in February 1944 and ending in April 1954. The maximum smoothed sunspot number observed during the solar cycle was 218.7 (May 1947), and the starting minimum was 12.9. During the minimum transit from solar cycle 18 to 19, there were a total of 446 days with no sunspots. (en)
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  • April 1954 (en)
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  • February 1944 (en)
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  • Le cycle solaire 18 est le dix-huitième cycle solaire depuis 1755, date du début du suivi intensif de l'activité et des taches solaires. Il a commencé en 1944 et s'est achevé en 1954. (fr)
  • Solar cycle 18 was the eighteenth solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 10.2 years, beginning in February 1944 and ending in April 1954. The maximum smoothed sunspot number observed during the solar cycle was 218.7 (May 1947), and the starting minimum was 12.9. During the minimum transit from solar cycle 18 to 19, there were a total of 446 days with no sunspots. Cycle 18 was characterized by "giant" sunspots. The recording of the 10.7 cm (2800 MHz) solar radio flux began partway during this cycle, and values of the solar flux during this cycle turned out to be particularly high. (en)
  • 第18太陽周期(Solar cycle 18)は、1755年に太陽黒点の活動が記録され始めてから18番目の太陽活動周期である。1944年2月から1954年4月まで10.2年続いた。太陽黒点の最大数は151.8個で、最小数は3.4個だった。合計約446日間にわたり黒点が現れなかった。 (ja)
  • 第18太陽週期是從1755年開始紀錄太陽黑子以來的第18太陽週期，這個週期開始於1944年2月，結束於1954年4月，持續了10.2年。最大平滑黑子數(超過12個月期間的黑子月平均數值)為151.8，最小的數值為3.4，在這個週期內總共約有446天沒有黑子。 (zh)
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  • May 1947 (en)
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