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首页> 外文会议>Second Solar Cycle and Space Weather Euroconference Sep 24-29, 2001 Vico Equense, Italy >THE START OF THE DALTON MINIMUM: WAS ONE SUNSPOT CYCLE LOST IN LATE XVIII CENTURY?
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THE START OF THE DALTON MINIMUM: WAS ONE SUNSPOT CYCLE LOST IN LATE XVIII CENTURY?

机译：DALTON MINIMUM的开始：十八世纪后期，一个太阳斑循环消失了吗？

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We have recently suggested that one solar cycle was lost in the beginning of the Dalton minimum because of sparse and partly unreliable sunspot observations during 1790s (Usoskin et al. 2001). So far this cycle has been combined with the preceding activity to form the exceptionally long solar cycle #4 in 1784-1799 which has an irregular phase evolution (known as the phase catastrophe) and other problems discussed in earlier literature. Based on a re-analysis of available sunspot data, we have suggested that solar cycle #4 is in fact a superposition of two cycles: a normal cycle in 1784-1793 ending at the start of the Dalton minimum, and a new weak cycle in 1793-1800 which was the first cycle within the Dalton minimum. Including the new cycle resolves the phase catastrophe and leads to a consistent view of sunspot activity around the Dalton minimum. It also restores the Gnevyshev-Ohl rule of cycle pairing across the Daltom nimimum. Here we summarize these findings and show that the existence of a new cycle is supported by the auroral occurrence in Europe in late XVIII century.
机译：我们最近提出，由于1790年代稀少且部分不可靠的太阳黑子观测，在道尔顿极小值开始时失去了一个太阳周期（Usoskin等，2001）。到目前为止，该周期已与先前的活动结合在一起，形成了1784年至1799年异常长的第4号太阳周期，该周期具有不规则的相演化（称为相突变）和其他先前文献中讨论的问题。根据对现有太阳黑子数据的重新分析，我们认为第4个太阳周期实际上是两个周期的叠加：1784-1793年的正常周期结束于道尔顿极小值的开始，而新的弱周期出现在1784-1793年。 1793-1800年，这是道尔顿最低限度内的第一个周期。包括新的周期可以解决阶段性灾难，并使人们对道尔顿最小值附近的黑子活动保持一致的看法。它还恢复了整个Daltom nimimum的Gnevyshev-Ohl循环配对规则。在这里，我们总结了这些发现，并表明新周期的存在是由十八世纪末期欧洲极光事件支持的。

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