It was found that the decrease in solar activity does not always lead to a cooling
Scientists from Imperial College London and the University of Colorado recently presented the results of a new study of the sun. They were surprising: it seems that the decline in solar activity does not always lead to cooling.
It is well known that solar activity increases and decreases during the 11-year cycle, and with the decrease of the amount of solar radiation reaching the Earth, is also reduced. The new study analyzed the solar activity for the period 2004-2007, the period decreasing 11-year cycle. Although the activity of the sun during this period has dropped, a new study found that the Earth climate became warmer. Contrary to the expectations of the amount of energy reaching the Earth at visible wavelengths, has increased, not decreased, causing a warming effect.
Scientists believe that perhaps the observed reversal does occur, and that during periods when solar activity increases, the earth is heated and cooled. During the past century, solar activity increased, but because scientists believe that there was a cooling effect, not heat, as previously thought, according innovanews.
— The results of the study contradict the knowledge that scientists have made about the effect of the sun on our climate before — commented on the outcome of his colleagues, Professor Joanna Hay of London Imperial College. — However, the possibility remains that during the three years of the study period, we simply observed anomaly. We can not make meaningful conclusions based on such a short period of observation, and requires further study to better understand the solar activity and to examine the model of activity, by us, on a longer period of time. However, if further research supports our hypothesis, it is possible to assume that we overestimate the role of the sun to heat our planet.
— We know that the Earth's climate depends on human activity and by natural forces, and our new research improves understanding of how the Sun affects the climate — expressed his opinion and Professor Brian Hoskins, director of the Institute Grenhemskogo climate change at London's Imperial College. — Studies like this are vital to help us get a clear picture of how the climate is changing in the world, so we can learn how to influence it, and to protect themselves and the Earth.
And one sunny mystery: quiet Sun can unexpectedly run the storm! As it happened almost a year ago, in September 2009. Prior to this case, astronomers believed that the sun is dangerous for the Earth, when it appears a lot of spots — dark areas associated with a very strong magnetic field. These "moles" usually appear during periods of maximum solar activity. And then the earth rushing intensive flows of hazardous particles. But in 2009, which astronomers call the "year of the quiet sun," because it was in a long-time minimum of activity, the calm was deceptive. Despite the lull, for unknown reasons, then a three-fold increase in strength of the solar wind. And this storm, carrying a huge amount of high-energy charged particles, seriously threatening communications systems, satellites and even power facilities.
— Sun in recent years, more strikes us with its unpredictability — explains senior fellow at the National Center for the Study of the atmosphere Sarah Gibson. — As it turned out, the solar wind can water the earth as from a fire hose even when it does not have spots.