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单词
hale cycle
释义
Hale cycle
Hale cycle
[
′hāl ‚sī·kəl
]
(astronomy)
The variation of the sun's magnetic field over a period of approximately 22 years, during which the field reverses and is restored to its original polarity; one such cycle comprises two successive sunspot cycles.
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更新时间:2024/9/24 20:35:21