The flare is considered an M2.5 class flare due to the brightness and high energy emitted between 0522 UT and 0537 UT, using GOES satellite data , which can be seen daily on the Space Weather Page . This Active Region is numbered 8539 and is sitting to the left of the Sun's center. By this time the particles have already traveled 3 times the diameter of the Sun. The first place SOHO sees flares is in the EIT movies .
Flares appear as brightening in strong magnetic field regions.
Here you are seeing gases at approximately 1,000,000 degrees Kelvin in the ultraviolet region of the spectrum. This particular flare is seen in the upper left of the Sun not too far from the center. You can also see the flare from the NOAA GOES satellite . These movies are seen in visible light and the gases are at about 1 to 2 million degrees Kelvin. In this event most of the emission is to the upper left.