彩民宝典

Astronomers probing the edges of the Milky Way have in recent years observed some of the most brilliant pyrotechnic displays in the galaxy: superflares.听

These events occur when stars, for reasons that scientists still don鈥檛 understand, eject huge bursts of energy that can be seen from hundreds of light years away. Until recently, researchers assumed that such explosions occurred mostly on stars that, unlike Earth鈥檚, were young and active.

Now, with more confidence than ever before that superflares can occur on older, quieter stars like our own鈥攁lbeit more rarely, or about once every few thousand years.

The results should be a wake-up call for life on our planet, said Yuta Notsu, the lead author of the study and a visiting researcher at 彩民宝典.

If a superflare erupted from the sun, he said, Earth would likely sit in the path of a wave of high-energy radiation. Such a blast could disrupt electronics across the globe, causing widespread black outs and shorting out communication satellites in orbit.

Notsu will present his research at a press briefing today at the in St. Louis.听

鈥淥ur study shows that superflares are rare events,鈥� said Notsu, a researcher in 彩民宝典鈥檚 . 鈥淏ut there is some possibility that we could experience such an event in the next 100 years or so.鈥�

Scientists first discovered this phenomenon from an unlikely source: the Kepler Space Telescope. The NASA spacecraft, launched in 2009, seeks out planets circling stars far from Earth. But it also found something odd about those stars themselves. In rare events, the light from distant stars seemed to get suddenly, and momentarily, brighter.

Researchers dubbed those humungous bursts of energy 鈥渟uperflares.鈥�

Close to home

Notsu explained that normal-sized flares are common on the sun. But what the Kepler data was showing seemed to be much bigger, on the order of hundreds to thousands of times more powerful than the largest flare ever recorded with modern instruments on Earth.

And that raised an obvious question: Could a superflare also occur on our own sun?

鈥淲hen our sun was young, it was very active because it rotated very fast and probably generated more powerful flares,鈥� said Notsu, also of the in Boulder. 鈥淏ut we didn鈥檛 know if such large flares occur on the modern sun with very low frequency.鈥�

To find out, Notsu and an international team of researchers turned to data from the European Space Agency鈥檚 Gaia spacecraft and from the Apache Point Observatory in New Mexico. Over a series of studies, the group used those instruments to narrow down a list of superflares that had come from 43 stars that resembled our sun. The researchers then subjected those rare events to a rigorous statistical analysis.

The bottom line: age matters. Based on the team鈥檚 calculations, younger stars tend to produce the most superflares. But older stars like our sun, now a respectable 4.6 billion years old, aren鈥檛 off the hook.

鈥淵oung stars have superflares once every week or so,鈥� Notsu said. 鈥淔or the sun, it鈥檚 once every few thousand years on average.鈥�

The group in The Astrophysical Journal.

Notsu can鈥檛 be sure when the next big solar light show is due to hit Earth. But he said that it鈥檚 a matter of when, not if. Still, that could give humans time to prepare, protecting electronics on the ground and in orbit from radiation in space.听

鈥淚f a superflare occurred 1,000 years ago, it was probably no big problem. People may have seen a large aurora,鈥� Notsu said. 鈥淣ow, it鈥檚 a much bigger problem because of our electronics.鈥�

Co-authors on the recent study include researchers from Kyoto University, the National Astronomical Observatory of Japan, University of Hyogo, University of Washington and Leiden University.