Abstract
Some studies have shown that our knowledge of the solar activity in the years 1640, 1652, and 1741 can be improved. In this contribution, we revise the annual group sunspot numbers for these years from original observations. For the years 1640, 1652, and 1741, we have obtained the corrected values 15.2, 1.8, and 27.3, respectively (instead of the original values 15.0, 4.0, and 57.7).
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Clette, F., Berghmans, D., Vanlommel, P., van der Linden, R.A.M., Koeckelenbergh, A., Wauters, L.: 2007, Adv. Space Res. 40, 919. doi: 10.1016/j.asr.2006.12.045 .
Dobrzycki, J.: 1999, J. Hist. Astron. 30, 121.
Hevelius, J.: 1652, Illustribus Viris, Petro Gassendo, & Ismaeli Bullialdo, Philosophis ac Mathematicis nostri seculi summis, amicis suis officiose honorandis [Danzig].
Hoyt, D.V., Schatten, K.H.: 1995, Solar Phys. 160, 371. doi: 10.1007/BF00732815 .
Hoyt, D.V., Schatten, K.H.: 1998, Solar Phys. 179, 189. doi: 10.1023/A:1005007527816 .
IPCC: 2007, Climate Change 2007: the Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge, University Press, Cambridge.
Usoskin, I.G.: 2013, Living Rev. Solar Phys. 10, 1. doi: 10.12942/lrsp-2013-1 .
Usoskin, I.G., Mursula, K., Kovaltsov, G.A.: 2003, Solar Phys. 218, 295. doi: 10.1023/B:SOLA.0000013029.99907.97 .
Usoskin, I.G., Mursula, K., Arlt, R., Kovaltsov, G.A.: 2009, Astrophys. J. Lett. 700, L154. doi: 10.1088/0004-637X/700/2/L154 .
Vaquero, J.M.: 2007, Adv. Space Res. 40, 929. doi: 10.1016/j.asr.2007.01.087 .
Vaquero, J.M., Gallego, M.C., Sánchez-Bajo, F.: 2007, The Observatory 127, 221.
Vaquero, J.M., Gallego, M.C., Trigo, R.M.: 2007, Adv. Space Res. 40, 1895. doi: 10.1016/j.asr.2007.02.097 .
Vaquero, J.M., Trigo, R.M., Gallego, M.C.: 2012, Solar Phys. 277, 389. doi: 10.1007/s11207-011-9901-8 .
Vaquero, J.M., Gallego, M.C., Usoskin, I.G., Kovaltsov, G.A.: 2011, Astrophys. J. Lett. 731, L24. doi: 10.1088/2041-8205/731/2/L24 .
Wolf, R.: 1856, Mittheilungen über die Sonnenflecken 6, 151.
Zolotova, N.V., Ponyavin, D.I.: 2011, Astrophys. J. 736, 115. doi: 10.1088/0004-637X/736/2/115 .
Acknowledgements
The authors thank the Harvard University Library for providing a copy of the observation of Winthrop. J.M. Vaquero has benefited from the impetus and participation in the Sunspot Number Workshops ( http://ssnworkshop.wikia.com/wiki/Home ). Support from the Junta de Extremadura (Research Group Grant No. GR10131) and Ministerio de Economía y Competitividad of the Spanish Government (AYA2011-25945) is gratefully acknowledged. Ricardo M. Trigo was supported by the Portuguese Science Foundation (FCT) through project QSECA (PTDC/AAG-GLO/4155/2012).
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Vaquero, J.M., Trigo, R.M. Revised Group Sunspot Number Values for 1640, 1652, and 1741. Sol Phys 289, 803–808 (2014). https://doi.org/10.1007/s11207-013-0360-2
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DOI: https://doi.org/10.1007/s11207-013-0360-2