RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 10, ES3005, doi:10.2205/2007ES000247, 2008

Figure 1. Solar activity since the invention of the telescope
(1610): the degree of confidence of the observational data is
shown graphically; red crosses: isolated observations; light-blue
curve: restored monthly average Wolf numbers (low confidence);
dark-blue curve: trustworthy monthly average Wolf numbers
(http://commons.wikimedia.org/wiki/Image:Sunspot_Numbers.png).

Citation: Ishkov, V. N. (2008), Solar geoeffective phenomena: Impact on the near-Earth space and the opportunity to forecast, Russ. J. Earth Sci., 10, ES3005, doi:10.2205/2007ES000247.
Copyright 2008 by the Russian Journal of Earth Sciences
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