Solar cycle 24 – magnetic activity down, twin peaks seem certain

NOAA’s Space Weather Prediction Center (SWPC) has published its latest graphs for the month of July, and while sunspot and radio flux numbers showed little change and increased respectively, the Geomagnetic Ap index is back near the bottom again. Further, as we noted back in October of 2013, and as NASA suggested in May 2013,…

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Record levels of solar ultraviolet measured in South America

From Frontiers A team of researchers in the U.S. and Germany has measured the highest level of ultraviolet radiation ever recorded on the Earth’s surface. The extraordinary UV fluxes, observed in the Bolivian Andes only 1,500 miles from the equator, are far above those normally considered to be harmful to both terrestrial and aquatic life.…

Solar Notch-Delay Model Released

Readers may recall the contentious discussions that occurred on this thread a couple of weeks back. Both Willis Eschenbach and Dr. Leif Svalgaard were quite combative over the fact that the model data had not been released. But that aside, there is good news. David Archibald writes in to tell us that the model has…

A Cool Question, Answered?

Guest essay by David Archibald A couple of years ago the question was asked “When will it start cooling?” Of course solar denialists misconstrued this innocent enquiry. There is no doubt – we all know that lower solar irradiance will result in lower temperatures on this planet. It is a question of when. Solar activity…

Maunder and Dalton Sunspot Minima

Guest Post by Willis Eschenbach In a recent interchange over at Joanne Nova’s always interesting blog, I’d said that the slow changes in the sun have little effect on temperature. Someone asked me, well, what about the cold temperatures during the Maunder and Dalton sunspot minima? And I thought … hey, what about them? I…