The Active Sun Fired Off a Big Solar Flare: Watch It Live Today

You can get an up-close look at our dynamic sun, which has been putting on quite a show lately, during a live webcast today (Sept. 11).

The sun fired off a medium-strength flare on Tuesday (Sept. 9), then followed up with an Earth-directed X-class flare — the most powerful type — on Wednesday evening (Sept. 10). Both storms erupted from a sunspot known as Active Region 2158, which will be the focus of a webcast hosted today at 1 p.m. EDT (1700 GMT) by the online Slooh Community Observatory on its website:

You can also watch the solar flare webcast on, courtesy of Slooh.

Wednesday's storm likely did produce a CME in addition to the X1.6 flare, experts with the National Weather Service's Space Weather Prediction Center said. If that's the case, the CME would also be aimed at Earth.

The sun unleashed an X-class solar flare — the most powerful type of solar eruption — on Sept. 10, 2014. This image of the Earth-directed flare was taken by NASA's Solar Dynamics Observatory. (Image credit: NASA/SDO)

Solar flares are bursts of high-energy radiation. Big ones are often accompanied by coronal mass ejections (CMEs), which send clouds of superheated solar plasma streaking through space at millions of miles per hour. CMEs that hit Earth can trigger intense geomagnetic storms, which in turn may temporarily disrupt GPS navigation, radio communications and power grids.

"A government-sponsored panel in 2008 estimated that such a solar event today would likely destroy the U.S. electrical grid, inflict a staggering $1 to $2 trillion dollars worth of damage, and require over a year to repair," Berman added. "So it’s more than of mere academic interest to monitor and observe these violent events as they unfold. Plus, they're amazing to watch.""What solar experts fear most is a recurrence of the huge coronal mass ejection events of 1921 and 1859," Slooh astronomer Bob Berman said in a statement.

Thursday's show will originate from the Prescott Observatory in Arizona, whose special solar equipment is expected to give viewers great views at the sun and sunspot AR 2158, Slooh officials said. Berman, Slooh host Geoff Fox and Prescott Observatory owner Matt Francis will participate.

Warning: Never look directly at the sun through telescopes, binoculars or with your unaided eye without protective equipment. Astrononomers and solar observers use special solar filters to safely view the sun.

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Many of us take the sun for granted, giving it little thought until it scorches our skin or gets in our eyes. But our star is a fascinating and complex object, a gigantic fusion reactor that gives us life. How much do you know about the sun?

Solar Showdown: How Well Do You Know Our Sun?

Mike Wall Senior Writer
Michael was a science writer for the Idaho National Laboratory and has been an intern at, The Salinas Californian newspaper, and the SLAC National Accelerator Laboratory. He has also worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz.