A Revised Collection of Sunspot Group Numbers
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- 作者：J. M. Vaquero ; L. Svalgaard ; V. M. S. Carrasco ; F. Clette ; L. Lefèvre…
- 关键词：Sunspots ; statistics ; Solar cycle ; observations
- 刊名：Solar Physics
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：291
- 期：9-10
- 页码：3061-3074
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Astrophysics and Astroparticles; Atmospheric Sciences; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics);
- 出版者：Springer Netherlands
- ISSN：1573-093X
- 卷排序：291
文摘
We describe a revised collection of the number of sunspot groups from 1610 to the present. This new collection is based on the work of Hoyt and Schatten (Solar Phys. 179, 189, 1998). The main changes are the elimination of a considerable number of observations during the Maunder Minimum (hereafter, MM) and the inclusion of several long series of observations. Numerous minor changes are also described. Moreover, we have calculated the active-day percentage during the MM from this new collection as a reliable index of the solar activity. Thus, the level of solar activity obtained in this work is greater than the level obtained using the original Hoyt and Schatten data, although it remains compatible with a grand minimum of solar activity. The new collection is available in digital format.