Solar Flare - Classification


Solar flares are classified as A, B, C, M or X according to the peak flux (in watts per square metre, W/m2) of 100 to 800 picometre X-rays near Earth, as measured on the GOES spacecraft.

Classification Peak Flux Range at 100-800 picometre
(Watts/square metre)
A < 10−7
B 10−7 - 10−6
C 10−6 - 10−5
M 10−5 - 10−4
X > 10−4

Within a class there is a linear scale from 1 to 9.n (apart from X), so an X2 flare is twice as powerful as an X1 flare, and is four times more powerful than an M5 flare. X class flares up to at least X28 have been recorded.(see below)

Read more about this topic:  Solar Flare

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