File:Graph of sunspot numbers between 1610-1990. More sunspots generally mean more energy received by the Earth (NASA).png
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English: Graph of sunspot numbers between 1610-1990. The graph is by Robert Simmon, based on data from Hoyt and Schatten (1997) (referred to by Riebeek, 2010). Data from Hoyt and Schatten (1997) can be downloaded from the NGDC (2009). From the cited Riebeek (2010) public-domain source: "Records of sunspots dating back to 1610 provide an indication of energy output from the Sun. In general, more sunspots (blue peaks) mean more intense solar activity and more energy received by the Earth. On average, there are more sunspots now than during the Maunder Minimum 350 years ago, but the increase in solar activity alone is not sufficient to explain the temperature increases that have occurred since 1950." For more information, see attribution of recent climate change. References:
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| Source | sunspots_narrow.png, in: Has the Sun been more active in recent decades, and could it be responsible for some global warming? (Riebeek, H., June 24, 2010), part of: Climate Q&A : Blogs. Publisher: Earth Observatory, part of the EOS Project Science Office, located at NASA Goddard Space Flight Center. |
| Author | Robert Simmon |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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| current | 05:36, 27 October 2012 | | 576 × 104 (11 KB) | Enescot (talk | contribs) | {{Information |Description ={{en|1=Graph of sunspot numbers between 1610-1990. The graph is by Robert Simmon, based on data from Hoyt and Schatten (1997) (referred to by Riebeek, 2010). Data from Hoyt and Schatten (1997) can be downl... |
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