The Sun emitted a significant solar flare, peaking at 12:06 p.m. EDT on September 10, 2017. NASA’s Solar Dynamics Observatory, which watches the Sun constantly, captured an image of the event. Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however — when intense enough — they can disturb the atmosphere in the layer where GPS and communications signals travel.
This flare is classified as an X8.2-class flare. X-class denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, etc.
This flare is the capstone on a series of flares from Active Region 2673, which was identified on August 29 and is currently rotating off the front of the Sun as part of our star’s normal rotation.
Image Credit: NASA/SDO/Goddard
Explanation from: https://www.nasa.gov/feature/goddard/2017/active-region-on-sun-continues-to-emit-solar-flares
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