Abstract
The Wolf or Zürich sunspot number Rz, (values available from 1700 onwards) is considered the primary descriptor of solar activity for the past 100 years or more. Recently, another, more accurate time series, called the Group sunspot number, R G, has become available. Comparison of the indices suggests that Rzmay be grossly overestimated in the early sunspot records. In this paper, some results based previously on Rzare reexamined using R G. Conclusions based on data from about 1850 to the present remain the same. For the 18th century, however, small differences are seen. For estimates of solar irradiance in the Maunder Minimum (1645–1715), because both Rzand R Gwere near zero then and are almost comparable today, irradiance estimates remain about the same, whether Rzor R Gis used to calculate them. However, the evolutions of Rzand R Gfrom their near zero value in the Maunder Minimum to their present similar value, are different, with Rzincreasing more rapidly than R Gfrom 1700 to 1790. While the temperature of the Earth has increased almost monotonically for the past few centuries, the relationship of both Rzand R Gwith the temperature trend is not especially great.
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Bradley, R. S. and Jones, P. D.: 1993, The Holocene 3, 367.
Butler, C. J.: 1994, Solar Phys. 152, 35.
Eddy, J. A.: 1976, Science 192, 1189.
Eddy, J. A.: 1977, in O. R. White (ed.), The Solar Output and its Variations, Colorado Associated University Press, Boulder, pp. 51-71.
Eddy, J. A.: 1980, in R. O. Pepin, J. A. Eddy, R. B. Merril (eds.), The Ancient Sun, Pergamon Press, New York, pp. 119-134.
Eddy, J. A.: 1983, Solar Phys. 89, 195.
Folland, C. K., Parker, D. E., Colman, A. W., and Washington, R.: 1998, Climate Research Technical Note CRTN 81, Hadley Center, Meteorological Office, Bracknell, U.K..
Foukal, P. and Lean, J.: 1990, Science 247, 556.
Friis-Christensen, E. and Lassen, K: 1991, Science 254, 698.
Fröhlich, C. and Lean, J.: 1998, Geophys. Res. Lett. 25, 4377.
Gleissberg, W.: 1944, Terrest. Mag. Atmospheric. Elect. 49, 243.
Gleissberg, W.: 1965, J. Br. Astron. Assoc. 75, 227.
Grove, J. M., 1988: The Little Ice Age, Methuen, London.
Groveman, B. S. and Landsberg, H. E.: 1979, Geophys. Res. Lett. 6, 767.
Hansen, J. E. and Lebedeff, S.: 1988, Geophys. Res. Lett. 15, 323.
Hansen, J. et al.: 1997, J. Geophys. Res. 102, 25 679.
Houghton, J. T., Callander, B. A., and Varney, S. K. (eds.): 1992, Intergovernmental Panel on Climate Change, Climate Change 1992, Supplement to the IPCC Scientific Assessment, Cambridge University Press, Cambridge.
Hoyt, D. V. and Schatten, K. H.: 1993, J. Geophys. Res. 98, 18 895.
Hoyt, D. V. and Schatten, K. H.: 1997, The Role of the Sun in Climate Change, Oxford Press, Oxford, 279 pp.
Hoyt, D. V. and Schatten, K. H.: 1998a, Solar Phys. 179, 189.
Hoyt, D. V. and Schatten, K. H.: 1998b, Solar Phys. 181, 491.
Hoyt, D. V., Schatten, K. H., and Nesmes-Ribes, E.: 1994, Geophys. Res. Lett. 21, 2067.
Jones, P. D., Raper, S. C. B., Bradley, R. S., Diaz, H. F., Kelly, P. M., and Wigley, T. M. L.: 1986, J. Clim. Appl. Meteor. 25, 161.
Kane, R. P.: 1978, Nature 274, 139.
Kane, R. P.: 1987, Solar Phys. 108, 415.
Kane, R. P.: 1998, Geophys. Res. Lett. 25, 3121.
Kane, R. P.: 1999, Solar Phys. 189, 217.
Kane, R. P. and Trivedi, N. B.: 1985, Geomag. Geoelect. 37, 1071.
Kane, R. P. and Trivedi, N. B.: 1991, 135, 463.
Kelly, P. M. and Wigley, T. M. L.: 1990, Nature 347, 460.
Kocharov, G. E.: 1987, Astrophys. Space. Sci. 6, 155.
Lean, J: 1987, J. Geophys. Res. 92, 839.
Lean. J., Skumanich, A., and White, O.: 1992, Geophys. Res. Lett. 19, 1591.
Lean, J., Beer, J., and Bradley, R.: 1995, Geophys. Res. Lett. 22, 3195.
MacDonald, G. J.: 1989, Rev. Geophys. 27, 449.
Mayaud, P. N.: 1973, IAGA Bull. 33, 262
McKinnon, J. A.: 1987, UAG Report 95, p. 112, NOAA Boulder, Colorado, U.S.A.
Nesme-Ribes, E. and Manganey, A.: 1992, Radiocarbon 34, 263.
Nevanlinna, H. and Kataja, E.: 1993, Geophys. Res. Lett. 20, 2703.
Ohl, A. I.: 1966, Soln. Dan.No. 12, 84.
Ohl, A. I.: 1976, Soln. Dan.No. 9, 73.
Ohl, A. I. and Ohl, G. I.: 1979, in R. F. Donnely (ed.), Solar-Terrestrial Predictions Proceedings, pp. 258-263, NOAA/Space Environmental Laboratories, Boulder, Colorado.
Parker, D. E., Jones, P. D., Folland, C. K., and Bevan, A.: 1994, J. Geophys. Res. 99, 14 373
Reid, G. C.: 1987, Nature 329, 142.
Reid, G. C.: 1991, J. Geophys. Res. 96, 2835.
Reid, G. C.: 1997, Clim. Change 37, 391.
Reid, G. C.: 1999, J. Atmospheric Solar-Terrest. Phys. 61, 3.
Sargent, H. H. III: 1978, Proc. 28th IEEE Vehicular Technical Conf., Denver, 490.
Waldmeier, M.: 1961, The Sunspot Activity in the Years 1610–1960, Schulthess & Company AG, Zürich.
Wigley, T. M. L. and Raper, S. C. B.: 1990, Geophys. Res. Lett. 17, 2169.
Willson, R. C.: 1997, Science 277, 1963.
Willson, R. C. and Hudson, H. S.: 1991, Nature 351, 42.
Wilson, R. M.: 1988, Geophys. Res. Lett. 15, 125.
Wilson, R. M.: 1990, Solar Phys. 125, 143.
Wilson, R. M.: 1998, J. Geophys. Res. 103, 11159.
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Kane, R. Some Implications Using the Group Sunspot Number Reconstruction. Solar Physics 205, 383–401 (2002). https://doi.org/10.1023/A:1014296529097
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DOI: https://doi.org/10.1023/A:1014296529097