from
NASA Website
Image Credit
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.
M-class flares are ten
times less powerful than the most intense flares, which are labeled
X-class. The number after the M provides more information about its
strength. An M2 is twice as intense as an M1, an M3 is three times
as intense, etc.
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