Pål Brekke Solforsker the Norwegian Space Centre complainant in the summer sun. - The shining brilliant than many summers here Lyngør, he writes in an e-mail. But the solar cycle we are in now is unusually weak. Activity on the sun fluctuates. In the start of a solar cycle, the surface is smooth and nice. Then it pops up dark spots. They increase in number, and when maximum after about five years - before there will be fewer of them. An entire cycle, from maximum to maximum takes about eleven years. Unusual released Pål Brekke Solforsker useless summer sun Lyngør.Solforsker Pål Brekke useless summer sun Lyngør. Photo: Private Right now there is a maximum in the solar cycle, but the sun is unusually lax. There are only half as many sunspots as the last solmaksimum in 2001. - We have had many strong solar cycle since 1950, says Brekke, and five years ago, most scientists thought that this solar cycle would be stronger than the previous one. But it was instead an unusually long and quiet solminimum. The first spot in this cycle first appeared in 2009, a year late. First, in 2010 the real whiz in the sun. The late start did scientists to reconsider, and projections for this solmaksimum was adjusted down. Adjusted down Such was the estimate for this solar cycle in 2008.Slik the estimate for this solar cycle in 2008. Photo: Nasa peak in the solar cycle we are now in was reached in 2011. In March, the researchers wondered if the number of sunspots would pick up again, and that there would be a new high now in 2013. Read: The sun loses spark There is still no evidence of it, and the estimates are now set even further down. - Evidence indicates that this cycle will be the weakest in 200 years, says Brekke. Will it be colder? Fewer sunspots means fewer eruptions on the sun, and the smaller northern lights. Could it also affect temperature on earth? This is the final estimate of the solar cycle, made in July 2013.Dette is the final estimate of the solar cycle, made in July 2013. Photo: Nasa thermal radiation from the sun varies little, just a few tenths of a degree. But the sun also emits UV rays. When the activity of the sun fell to slump in 2008 and 2009 there were also less UV radiation. It may have been the reason for the cold winters in northern Europe in those years. Read: Make the weak sun it colder? No consolation Between 1645 and 1715 there were also very few sunspots. And so cold in northern Europe that this period is called the "Little Ice Age", see the bottom. - The solar cycle is unusual, but that does not mean we are entering into a corresponding new long cold period, says Giuliana DeToma. Your browser does not support iframes. To see the sun out now (sdo.gsfc.nasa.gov) He is employed at the High Altitude Observatory in Colorado and working relationship between solar activity and climate. The Toma mean what we now see, more similar to the short-term weak solar cycles we also saw the start of the 1800 - and 1900. They have been named Gleissberg cycles after solar researcher who described them in 1933. Wolfgang Gleissberg said they would show up with a hundred years. If De Toma will also have the right top of the next cycle in 2024 will be released before activity picks up again.
Posted on: Tue, 16 Jul 2013 17:21:48 +0000
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