A New Calibrated Sunspot Group Series Since 1749: Statistics of Active Day Fractions

Solar Physics

Volumn 291, Issue 9-10, 2016, Pages 2685-2708

  Usoskin, I G ^a,b   Kovaltsov, G A ^a,c   Lockwood, M ^d   Mursula, K ^a   Owens, M ^d   Solanki, S K ^e,f  

^a UNIVERSITY OF OULU   (Finland)

^b UNIVERSITY OF OULU   (Finland)

^c IOFFE INSTITUTE   (Russian Federation)

^d UNIVERSITY OF READING   (United Kingdom)

^e MAX PLANCK INSTITUT FÜR SONNENSYSTEMFORSCHUNG   (Germany)

^f Kyung Hee University   (South Korea)

Author keywords

Solar activity; Solar cycle; Solar observations; Sunspots

Indexed keywords

EID: 84954311001     PISSN: 00380938     EISSN: 1573093X     Source Type: Journal    
DOI: 10.1007/s11207-015-0838-1     Document Type: Article

References (40)

1. Arlt, R.: 2008, Digitization of sunspot drawings by Staudacher in 1749 – 1796. Solar Phys. 247, 399. DOI. ADS.
2. Arlt, R., Leussu, R., Giese, N., Mursula, K., Usoskin, I.G.: 2013, Sunspot positions and sizes for 1825 – 1867 from the observations by Samuel Heinrich Schwabe. Mon. Not. Roy. Astron. Soc. 433, 3165. DOI.
3. Balmaceda, L.A., Solanki, S.K., Krivova, N.A., Foster, S.: 2009, A homogeneous database of sunspot areas covering more than 130 years. J. Geophys. Res. 114, A07104. DOI. ADS.
4. Baumann, I., Solanki, S.K.: 2005, On the size distribution of sunspot groups in the Greenwich sunspot record 1874 – 1976. Astron. Astrophys. 443, 1061. DOI. ADS.
5. Çakmak, H.: 2014, A digital method to calculate the true areas of sunspot groups. Exp. Astron. 37, 539. DOI. ADS.
6. Clette, F., Svalgaard, L., Vaquero, J.M., Cliver, E.W.: 2014, Revisiting the sunspot number: A 400-year perspective on the solar cycle. Space Sci. Rev. 186, 35. DOI.
7. Cliver, E.W., Ling, A.G.: 2016, The discontinuity in ∼1885 in the group sunspot number. Solar Phys. DOI.
8. Eddy, J.A.: 1976, The Maunder minimum. Science 192, 1189. DOI. ADS.
9. Harvey, K.L., White, O.R.: 1999, What is solar cycle minimum? J. Geophys. Res. 104, 19759. DOI. ADS.
10. Hathaway, D.H.: 2015, The solar cycle. Living Rev. Solar Phys. 12, 4. DOI. http://www.livingreviews.org/lrsp-2015-4.
11. Hoyt, D.V., Schatten, K.H., Nesmes-Ribes, E.: 1994, The one hundredth year of Rudolf Wolf’s death: Do we have the correct reconstruction of solar activity? Geophys. Res. Lett. 21, 2067. DOI. ADS.
12. Hoyt, D.V., Schatten, K.H.: 1992, New information on solar activity, 1779 – 1818, from Sir William Herschel’s unpublished notebooks. Astrophys. J. 384, 361. DOI. ADS.
13. Hoyt, D.V., Schatten, K.H.: 1995a, A new interpretation of Christian Horrebow’s sunspot observations from 1761 to 1777. Solar Phys. 160, 387. DOI. ADS.
14. Hoyt, D.V., Schatten, K.H.: 1995b, A revised listing of the number of sunspot groups made by Pastorff, 1819 to 1833. Solar Phys. 160, 393. DOI. ADS.
15. Hoyt, D.V., Schatten, K.H.: 1996, How well was the sun observed during the Maunder minimum? Solar Phys. 165, 181. DOI. ADS.
16. Hoyt, D.V., Schatten, K.H.: 1998, Group sunspot numbers: A new solar activity reconstruction. Solar Phys. 179, 189. DOI. ADS.
17. Kovaltsov, G.A., Usoskin, I.G., Mursula, K.: 2004, An upper limit on sunspot activity during the Maunder minimum. Solar Phys. 224, 95. DOI. ADS.
18. Leussu, R., Usoskin, I.G., Arlt, R., Mursula, K.: 2013, Inconsistency of the Wolf sunspot number series around 1848. Astron. Astrophys. 559, A28. DOI.
19. Lockwood, M., Owens, M.J., Barnard, L.: 2016, Tests of sunspot number sequences: 4. The “Waldmeier discontinuity” in various sunspot number and sunspot group number reconstructions. Solar Phys., this issue.
20. Lockwood, M., Owens, M.J., Barnard, L.: 2014, Centennial variations in sunspot number, open solar flux, and streamer belt width: 1. Correction of the sunspot number record since 1874. J. Geophys. Res. 119, 5172. DOI. ADS.
21. Lockwood, M., Rouillard, A.P., Finch, I., Stamper, R.: 2006, Comment on “The IDV index: Its derivation and use in inferring long-term variations of the interplanetary magnetic field strength” by Leif Svalgaard and Edward W. Cliver. J. Geophys. Res. 111, A09109. DOI. ADS.
22. Lockwood, M., Owens, M.J., Barnard, L., Usoskin, I.G.: 2015, in press, Tests of sunspot number sequences: 3. Effects of regression procedures on the calibration of historic sunspot data. Solar Phys.
23. Neuhäuser, R., Arlt, R., Pfitzner, E., Richter, S.: 2015, Newly found sunspot observations by Peter Becker from Rostock for 1708, 1709, and 1710. Astron. Nachr. 336, 623. DOI. ADS.
24. Ribes, J.C., Nesme-Ribes, E.: 1993, The solar sunspot cycle in the maunder minimum ad1645 to ad1715. Astron. Astrophys. 276, 549.
25. Senthamizh Pavai, V., Arlt, R., Diercke, A., Denker, C., Vaquero, J.M.: 2016, Sunspot group tilt angle measurements from historical observations. Adv. Space Res., submitted.
26. Solanki, S.K., Unruh, Y.C.: 2004, Spot sizes on Sun-like stars. Mon. Not. Roy. Astron. Soc. 348, 307. DOI. ADS.
27. Solanki, S.K., Usoskin, I.G., Kromer, B., Schüssler, M., Beer, J.: 2004, Unusual activity of the sun during recent decades compared to the previous 11,000 years. Nature 431, 1084. DOI. ADS.
28. Svalgaard, L., Schatten, K.H.: 2016, Reconstruction of the sunspot group number: the backbone method. Solar Phys. DOI.
29. Usoskin, I.G., Mursula, K., Kovaltsov, G.A.: 2003, Reconstruction of monthly and yearly group sunspot numbers from sparse daily observations. Solar Phys. 218, 295. DOI.
30. Usoskin, I.G.: 2013, A history of solar activity over millennia. Living Rev. Solar Phys. 10, 1. DOI. ADS.
31. Usoskin, I.G., Arlt, R., Asvestari, E., Hawkins, E., Käpylä, M., Kovaltsov, G.A., Krivova, N., Lockwood, M., Mursula, K., O’Reilly, J., Owens, M., Scott, C.J., Sokoloff, D.D., Solanki, S.K., Soon, W., Vaquero, J.M.: 2015, The Maunder minimum (1645 – 1715) was indeed a grand minimum: A reassessment of multiple datasets. Astron. Astrophys. 581, A95. DOI. ADS.
32. Usoskin, I.G., Solanki, S.K., Schüssler, M., Mursula, K., Alanko, K.: 2003, Millennium-scale sunspot number reconstruction: Evidence for an unusually active sun since the 1940s. Phys. Rev. Lett. 91, 211101. DOI. ADS.
33. Vaquero, J.M., Trigo, R.M.: 2014, Revised group sunspot number values for 1640, 1652, and 1741. Solar Phys. 289, 803. DOI. ADS.
34. Vaquero, J.M., Vázquez, M.: 2009, The Sun Recorded Through History: Scientific Data Extracted from Historical Documents, Astrophys. Space Sci. Lib. 361, Springer, Berlin. ADS.
35. Vaquero, J.M., Trigo, R.M., Gallego, M.C.: 2012, A simple method to check the reliability of annual sunspot number in the historical period 1610 – 1847. Solar Phys. 277, 389. DOI. ADS.
36. Vaquero, J.M., Gallego, M.C., Usoskin, I.G., Kovaltsov, G.A.: 2011, Revisited sunspot data: A new scenario for the onset of the Maunder minimum. Astrophys. J. Lett. 731, L24. DOI. ADS.
37. Vaquero, J.M., Kovaltsov, G.A., Usoskin, I.G., Carrasco, V.M.S., Gallego, M.C.: 2015, Level and length of cyclic solar activity during the maunder minimum as deduced from the active day statistics. Astron. Astrophys. 577, A71. DOI.
38. Willis, D.M., Wild, M.N., Warburton, J.S.: 2016, Re-examination of the daily number of sunspot groups for the Royal Observatory, Greenwich (1874 – 1885). Solar Phys., this issue.
39. Willis, D.M., Henwood, R., Wild, M.N., Coffey, H.E., Denig, W.F., Erwin, E.H., Hoyt, D.V.: 2013a, The Greenwich photo-heliographic results (1874 – 1976): Procedures for checking and correcting the sunspot digital datasets. Solar Phys. 288, 141. DOI. ADS.
40. Willis, D.M., Coffey, H.E., Henwood, R., Erwin, E.H., Hoyt, D.V., Wild, M.N., Denig, W.F.: 2013b, The Greenwich photo-heliographic results (1874 – 1976): Summary of the observations, applications, datasets, definitions and errors. Solar Phys. 288, 117. DOI. ADS.