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THE LOST SUNSPOT CYCLE: REANALYSIS OF SUNSPOT STATISTICS

机译:失去的太阳黑子周期:对太阳黑子统计的重新分析

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摘要

We have recently suggested (Usoskin et al., 2000) that one low sunspot cycle was possibly lost in 1790s, and argued (Usoskin et al., 2002) that the existence of such a cycle does not contradict with available solar proxies, like auroral observations and cosmogenic isotopes. However, some arguments based on a statistical analysis of sunspot activity have been presented against the lost cycle (Krivova et al., 2002). Since the consequences of a new cycle are significant for solar cycle studies, it is important to try to estimate the probability of such a cycle to exist. Here we present the results of a rigorous statistical analysis of all available sunspot observations around the suggested additional cycle minimum in 1792-1793. We show that the level of sunspot activity in 1792-1793 is statistically similar to that in the minimum phase, but significantly different from that in the mid-declining or maximum phases. Using the estimated uncertainties we also calculate new, weighted annual values of group sunspot numbers in 1790-1796 which show a clear minimum in 1792-1793 and a maximum in 1794-1795, supporting the idea of an additional weak cycle in 1790's.
机译:我们最近建议(Usoskin等,2000)在1790年代可能失去了一个低太阳黑子周期,并指出(Usoskin等,2002)这种周期的存在与现有的太阳代理(如极光)并不矛盾。观测和宇宙成因同位素。但是,已经提出了一些基于对黑子活动的统计分析的论据来应对失去的周期(Krivova等,2002)。由于新周期的后果对于太阳周期研究很重要,因此重要的是尝试估计这种周期存在的可能性。在这里,我们提出了对所有在1792-1793年建议的最小附加周期最小值附近可用的黑子观测值进行严格统计分析的结果。我们发现,1792-1793年的黑子活动水平在统计上与最小阶段相似,但与中间下降阶段或最大阶段明显不同。使用估计的不确定性,我们还计算了1790-1796年组黑子数的新的加权年值,这在1792-1793年间显示出最小值,而在1794-1795年间出现最大值,这支持了1790年代又一个弱周期的想法。

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