Are Large Sunspots Dominant in Naked-eye Sunspot Observations for 1819–1918?
Are Large Sunspots Dominant in Naked-eye Sunspot Observations for 1819–1918?
复制标题
1819 年至 1918 年肉眼太阳黑子观测中,大太阳黑子占主导地位吗?
DOI:
10.3847/1538-4357/ab6ddb
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发表时间:
2020-02
期刊:
影响因子:
--
通讯作者:
Huiduan Li
中科院分区:
文献类型:
--
作者:
Hongrui Wang;Huiduan Li
This article explores the sizes of sunspots as determined by naked-eye sunspot observations (NSOs). The international sunspot number (ISN), the group sunspot number, and the Greenwich photo-heliographic results (GPR) were utilized. According to the ISN results, 64% of NSOs from 1819 to 1918 have been identified as large sunspots. We found that the sunspot sizes had been considerably underestimated using the ISN data (compared to using the GPR data). About 40% of NSOs from 1819 to 1918 have been identified as giant sunspots, which have ranks of sunspot areas smaller than 5%. The results in this article indicate that the majority of NSOs are large sunspots. This calls into question the previous understanding that NSOs include sunspots of all sizes above the visibility limit.
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影响因子:
2.8
作者:
L. Svalgaard;K. Schatten
通讯作者:
L. Svalgaard;K. Schatten
DOI:
10.3847/1538-4357/aadae2
发表时间:
2018-05
期刊:
The Astrophysical Journal
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DOI:
10.3847/1538-4357/aa767a
发表时间:
2017-05
期刊:
The Astrophysical Journal
影响因子:
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通讯作者:
R. Cameron;M. Schussler
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20.9
作者:
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I. Usoskin