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The Age of the Active Sun

13.07.2005

In the last 60 years, our luminary has been more active than at any time in 8000 years. German geophysicists came to this conclusion.

Although astronomers directly observe and record the expression of the turbulent processes occurring on the Sun - sunspots are only four hundred years old, since the telescope appeared, there is another way to measure the activity of the Sun, allowing you to look much deeper into the past.

Cosmic rays, hitting carbon dioxide molecules, generate the carbon isotope C-14 in the upper atmosphere. The stronger this radiation, the more C-14. The intensity of cosmic rays depends on the activity of the Sun: when it is high, the magnetic field of the star partially shields the Earth from cosmic particles. And since plants feed on carbon dioxide, taking it from the atmosphere along with the isotope, it is possible to measure the C-14 content in the tree rings of fossil wood and estimate what solar activity was at the time when this tree was growing.

So far, scientists have managed to look into the past by 11 years. It turned out that now we live in a period of such high solar activity, which was observed only more than 400 years ago. Accordingly, the Sun now shines a little brighter than in the last thousand years.

When asked whether global warming is related to this, the researchers answer that in the last 20-25 years, solar activity has been almost unchanged, and temperatures on Earth have been noticeably increasing. So it's most likely not the Sun's fault.

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Random news from the Archive

Life in the city is healthier than in the countryside 03.05.2004

Approximately this conclusion was led by a study carried out by the National Center for Intelligent Growth at the University of Maryland (USA).

Collected data on the health of more than 200 thousand residents of 83 large American cities and 448 administrative districts, consisting of small towns, towns and individual farms. It turned out that the closer to nature the landscape of the area, the higher the average weight of its inhabitants.

A resident of a large city is on average three kilograms lighter than a "villager" (for all the conventionality of this term for modern America), he has lower blood pressure, he is less likely to get diabetes and walks more.

According to the head of the research team Reid Ewing, the whole point is precisely in this last feature of behavior. In cities, everything is closer - and shops, places of entertainment, and even work are often within walking distance. And a resident of the countryside is forced to go to work, shopping, and going to the cinema by car.

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