NASAのインスタグラム(nasa) - 10月28日 10時27分

One giant sunspot, 6 substantial flares. The bright light in the lower right of the sun shows an X-class solar flare on Sunday, as captured by NASA Solar Dynamics Observatory, which watches the sun constantly, captured images of the event. This was the third X-class flare in 48 hours, which erupted from the largest active region seen on the sun in 24 years.

Solar flares are powerful bursts of radiation. They can't physically affect humans on the ground, but -- when intense enough -- can disturb the atmosphere where GPS and communications signals travel.

Image Credit: NASA/SDO

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