... sunspot number 黑子数 period of sunspot activity 太阳黑子活动周期... sunspot activity period 太阳黑子活动周期...
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period of sunspot activity
太阳黑子活动期
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That was followed by a period of even lower sunspot activity that lasted 90 years from 1460 to 1550 known as the Sporer Minimum.
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That was followed by the Dalton Minimum from 1790 to 1830, another period of well below normal sunspot activity.
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