Sun Unleashes Largest Solar Flare in Years

Aug. 9, 2011 solar flare in ultraviolet range
This still from a video taken by NASA's Solar Dynamics Observatory shows the Aug. 8, 2011 solar flare as it appeared in the ultraviolet range of the light spectrum. The flare registered as an X6.9 class sun storm, the largest of the Solar Cycle 24.
CREDIT: NASA/SDO/GSFC

An extremely powerful solar flare, the largest in over four years, rocked the sun early Tuesday (Aug. 9), but is unlikely to wreak any serious havoc here on Earth, scientists say.

"It was a big flare," said Joe Kunches, a space scientist with the National Oceanic and Atmospheric Administration (NOAA)'s Space Weather Prediction Center. "We lucked out because the site of the eruption at the sun was not facing the Earth, so we will probably feel no ill effects."

Today's solar flare began at 3:48 a.m. EDT (0748 GMT), and was rated a class X6.9 on the three-class scale scientists use to measure the strength of solar flares. The strongest type of solar eruption is class X, while class C represents the weakest and class M flares are medium-strength events. [Sun's Wrath: Worst Solar Storms in History]

The flare is the largest one yet in the sun's current cycle, which began in 2008 and is expected to last until around 2020. Solar activity waxes and wanes over an 11-year sun weather cycle, with the star currently heading toward a solar maximum in 2013.

http://www.space.com/12580-sun-unleashes-major-solar-flare.html

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