mamooth
Diamond Member
Basically, they find there hasn't been any 20th century increase in solar activity. The supposed increase was an artifact of better instruments being able to spot more sunspots. And if there was no 20th century increase, then warming can't be blamed on an increase that didn't happen.
One of the authors is Leif Svalgaard, a WUWT regular contributor and darling of the deniers. Hence, it's going to be tough to declare it's all part of the big socialist conspiracy. That is, unless you want to toss Svalgaard under the bus.
New sunspot analysis shows rising global temperatures not linked to solar activity - physicsworld.com
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The new correction of the sunspot number, called the sunspot number version 2.0, led by Frédéric Clette, director of the World Data Centre for Sunspot Index and Long-term Solar Observations (WDC–SILSO) and based at the Royal Observatory of Belgium, Ed Cliver of the National Solar Observatory in the US and Leif Svalgaard of Stanford University in the US, nullifies the claim that there has been a modern grand maximum. Indeed, the researchers say in their abstract that their study is "the first end-to-end revision of the sunspot number since the creation of this reference index of solar activity by Rudolf Wolf in 1849 and the simultaneous recalibration of the group number", and that their results mean that there is no longer any substantial difference between the two historical records.
Clette and colleagues’ results make it difficult to explain the observed changes in the climate that started in the 18th century and extended through the industrial revolution to the 20th century as being significantly influenced by natural solar trends. According to the researchers, they have identified the apparent upward trend of solar activity between the 18th century and the late 20th century as a major calibration error in the GSN. Now that this error has been corrected, solar activity appears to have remained relatively stable since the 1700s.
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One of the authors is Leif Svalgaard, a WUWT regular contributor and darling of the deniers. Hence, it's going to be tough to declare it's all part of the big socialist conspiracy. That is, unless you want to toss Svalgaard under the bus.
New sunspot analysis shows rising global temperatures not linked to solar activity - physicsworld.com
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The new correction of the sunspot number, called the sunspot number version 2.0, led by Frédéric Clette, director of the World Data Centre for Sunspot Index and Long-term Solar Observations (WDC–SILSO) and based at the Royal Observatory of Belgium, Ed Cliver of the National Solar Observatory in the US and Leif Svalgaard of Stanford University in the US, nullifies the claim that there has been a modern grand maximum. Indeed, the researchers say in their abstract that their study is "the first end-to-end revision of the sunspot number since the creation of this reference index of solar activity by Rudolf Wolf in 1849 and the simultaneous recalibration of the group number", and that their results mean that there is no longer any substantial difference between the two historical records.
Clette and colleagues’ results make it difficult to explain the observed changes in the climate that started in the 18th century and extended through the industrial revolution to the 20th century as being significantly influenced by natural solar trends. According to the researchers, they have identified the apparent upward trend of solar activity between the 18th century and the late 20th century as a major calibration error in the GSN. Now that this error has been corrected, solar activity appears to have remained relatively stable since the 1700s.
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