ARLA/CLUSTER: Universidade de Lund na Suécia assinala duas tempestades solares extremas registadas à mais de 1000 anos,

[João Costa > CT1FBF]

Extreme Solar Storms

Researchers at Lund University in Sweden have said that Earth was hit
by two extreme solar storms more than 1000 years ago

“If such enormous solar storms would hit Earth today, they could have
devastating effects on our power supply, satellites and communication
systems”, says Raimund Muscheler at the Department of Geology, Lund
University.

A team of researchers at Lund University, together with colleagues at
Uppsala University in Sweden, as well as researchers in Switzerland,
Denmark and the US, have been looking for traces of solar storms in
ice cores from Greenland and Antarctica. Everywhere on Earth you can
find traces of cosmic rays from the Galaxy and the sun, such as low
levels of radioactive carbon.

A few years ago researchers found traces of a rapid increase of
radioactive carbon in tree rings from the periods AD 774/775 and AD
993/994. The cause for these increases was, however, debated.

“In this study we have aimed to work systematically to find the cause
for these events. We have now found corresponding increases for
exactly the same periods in ice cores. With these new results it is
possible to rule out all other suggested explanations, and thereby
confirm extreme solar storms as the cause of these mysterious
radiocarbon increases”, says Raimund Muscheler.

Read the full story at
http://www.lunduniversity.lu.se/article/traces-of-enormous-solar-storms-in-the-ice-of-greenland-and-antarctica