Video: Solar flare to bring northern lights

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updated 7/13/2012 7:23:08 PM ET 2012-07-13T23:23:08

A massive solar eruption may trigger an exceptional display of northern lights this weekend, giving skywatchers around the world a treat.

The sun unleashed an X-class solar flare — the most powerful type — at 12:52 p.m. ET on Thursday. The storm also triggered a huge eruption of solar plasma known as a coronal mass ejection, or CME, which is now streaking directly toward Earth at roughly 3 million mph (5 million kilometers per hour).

The CME is expected to hit our planet between 5 a.m. and 9 a.m. ET Saturday, according to forecasts from NASA and the National Oceanic and Atmospheric Administration's Space Weather Prediction Center.

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Thursday's solar outburst officially rated as an X1.4-class flare, making it the strongest sun storm of the summer so far. The flare and CME erupted from a massive sunspot known as AR1520, which scientists say may be up to 186,000 miles (300,000 kilometers) long. [Photos: Solar Flares From Giant Sunspot AR1520]

The CME's arrival at Earth will likely spawn moderate geomagnetic storms lasting through Sunday, which may cause temporary disruptions to GPS signals, radio communications and power grids, scientists said.

Geomagnetic storms often generate dramatic aurora displays, which are also known as the northern and southern lights. So aurora fans should definitely crane their necks skyward this weekend.

The latest geomagnetic storm predictions "would indicate aurora down to the northern U.S.," C. Alex Young, a solar astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Md., told Space.com in an email update.

Earlier forecasts had hinted that this weekend's light shows could reach as far south as Alabama. But further number-crunching scaled back the estimates of the coming geomagnetic storm's severity, Young said, suggesting a more limited auroral reach.

"I am disappointed that I probably won't see any in Maryland," Young said.

Auroras occur when charged particles from the sun collide with molecules high up in Earth's atmosphere, generating a glow. The northern and southern lights are usually restricted to high latitutes because Earth's magnetic field lines tend to funnel these particles over the planet's poles.

After remaining surprisingly quiet from 2005 through 2010, our star woke up last year. It has remained active in 2012, spouting off numerous CMEs and powerful solar flares, including an X5.4-class eruption in March.

Such outbursts are likely to continue over the next year or so. Solar activity waxes and wanes on an 11-year cycle, and scientists think the current one — known as Solar Cycle 24 — will peak in 2013.

We should expect more action from sunspot AR1520 over the next week, said Joe Kunches of the SWPC. The sunspot region is currently facing Earth, sitting near the center of the sun's southern hemisphere.

"It's still big. It's right down Main Street," Kunches told Space.com. "It's in an absolutely prime spot."

If you snap a photo of sunspot AR1520 or any amazing northern lights photos and you'd like to share them for a possible story or image gallery, please send images and comments to managing editor Tariq Malik at tmalik@space.com.

Space.com managing editor Tariq Malik (@tariqjmalik) contributed to this story. Follow Space.com senior writer Mike Wall on Twitter @michaeldwallor SPACE.com @Spacedotcom. We're also on Facebookand Google+.

© 2013 Space.com. All rights reserved. More from Space.com.

Photos: Month in Space: January 2014

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    Stars, galaxies and nebulas dot the skies over the European Southern Observatory's La Silla Paranal Observatory in Chile, in a picture released on Jan. 7. This image also shows three of the four movable units that feed light into the Very Large Telescope Interferometer, the world's most advanced optical instrument. Combining to form one larger telescope, they are greater than the sum of their parts: They reveal details that would otherwise be visible only through a telescope as large as the distance between them. (Y. Beletsky / ESO) Back to slideshow navigation
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    Cameras captured the Grandville High School RoboDawgs' balloon floating through Earth's upper atmosphere during its ascent on Dec. 28, 2013. The Grandville RoboDawgs’ first winter balloon launch reached an estimated altitude of 130,000 feet, or about 25 miles, according to coaches Mike Evele and Doug Hepfer. It skyrocketed past the team’s previous 100,000-feet record set in June. The RoboDawgs started with just one robotics team in 1998, but they've grown to support more than 30 teams at public schools in Grandville, Mich. (Kyle Moroney / AP) Back to slideshow navigation
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    Russian cosmonauts Oleg Kotov, right, and Sergey Ryazanskiy perform maintenance on the International Space Station on Jan. 27. During the six-hour, eight-minute spacewalk, Kotov and Ryazanskiy completed the installation of a pair of high-fidelity cameras that experienced connectivity issues during a Dec. 27 spacewalk. The cosmonauts also retrieved scientific gear outside the station's Russian segment. (NASA) Back to slideshow navigation
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    More about SpaceShipTwo on PhotoBlog (Virgin Galactic) Back to slideshow navigation
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    Slideshow: The Year in Space (Brian Peterson / The Bismarck Tribune via AP) Back to slideshow navigation
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