Scientists believe that cosmic rays may be global climate change

May 23, 2011DENMARK
— By shooting a beam of particles in a cloud chamber, physicists in Denmark and the UK, have shown how the cosmic rays can stimulate the formation of water droplets in the atmosphere. The researchers say that this is the best experimental evidence that the Sun affects the climate by changing the intensity of cosmic rays flux reaching the Earth's surface. Now, the traditional view of global warming, allegedly by the Intergovernmental Panel on Climate Change, is that most of the warming recorded in the last 50 years was caused by anthropogenic greenhouse gas emissions. But some scientists say that the sun can have a significant impact on climate change of the Earth, noting that in the last century has seen a strong correlation between global temperatures and solar activity. However, changes in the sun, the brightness is believed to have changed the temperature of the Earth is not more than a few hundredths of a degree over the last 150 years. Researchers have therefore been investigating the way that the sun can indirectly change the climate of the Earth, and one of the hypotheses put forward by Henrik Svensmark of the National Space Institute in Copenhagen, comes the connection between solar activity and cosmic ray flux. According to Svensmark, cosmic rays seed low-lying clouds that reflect some of our solar radiation back into space, and the number of cosmic rays reaching the Earth, depends on the intensity of the Sun's magnetic field. The magnetic field is stronger (as evidenced by the number of sunspots), more rays are deflected, fewer clouds are formed and why the earth is warming, at a time when the field is weaker, the Earth cools. "There is so much that is not known about the formation of clouds, so it is possible that this may be an important component of global warming," Svensmark said. —Environmental Studies

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