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.
The X9.3 flare was the largest flare so far in the current solar cycle, the approximately 11-year-cycle during which the sun’s activity waxes and wanes. The current solar cycle began in December 2008, and is now decreasing in intensity and heading toward solar minimum. This is a phase when such eruptions on the sun are increasingly rare, but history has shown that they can nonetheless be intense.
Flare - Capstone - Series - Flares - Region
This flare is the capstone on a series of flares from Active Region 2673, which was identified on Aug. 29 and is currently rotating off the front of the sun as part of our star’s normal rotation.
The flare was captured in the following NASA’s Goddard Space Flight Center video.
NASA - Solar - Dynamics - Observatory - Image
NASA’s Solar Dynamics Observatory captured this image of the solar flare:
The flare as seen in the bright flash on the right side on Sept. 10, 2017.
The National Oceanic and Atmospheric Administration signals X8.2 (R3-STRONG) X-RAY EVENT OBSERVED AT 10/1606 UTC. Primary areas impact includes ‘large portions of sunlit side of earth’. Possible effects include wide spread HF radio blackouts and navigation degradation through GPS (loss in signal).
SWLcom - Notes - Yesterday - X8 - R3-strong
As SWL.com notes, "yesterday's X8.2 (R3-strong) solar flare from sunspot region 2673 was one of the most spectacular solar flares we have ever seen. Not only was this the second strongest solar flare of the current solar cycle, it also launched an extremely fast and broad coronal mass ejection:
Following the flare, we quickly reached the strong S3 solar radiation storm level which only takes place about 10 times during a 11 year solar cycle. Possible effects of the ongoing...
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