http://www.universetoday.com/9018/its-official-that-was-an-x28-flare/ Image credit: ESA
Astronomers have confirmed that this week’s solar flare was a whopping X28 magnitude – definitely the largest flare ever recorded. The flare occurred on November 4, and quickly overwhelmed the X-ray detectors on several monitoring satellites. It was followed up by a coronal mass ejection that blasted out from the surface of the Sun at 2,300 kilometres per second. Fortunately the flare came off the side of the Sun, and seems to have had no effect on our Earth.
It has just been announced that the massive solar X-ray flare which occurred on 4 November was, at best estimate, an X28. There is still a small chance this will be revised by a small amount, but it is now official: We have a new number 1 X-ray flare for the record books, the most powerful in recorded observational history.
On Tuesday, 4 November 2003, this flare saturated the X-ray detectors on several monitoring satellites. The associated coronal mass ejection (CME) came out of the Sun’s surface at about 2300 kilometres per second (8.2 million km/h). Only part of the CME is directed towards Earth, so we expect the Earth will receive only a glancing blow, since the source region is pointing away from us on the right on the limb of the Sun as seen from Earth.
How we classify solar flares
Scientists classify solar flares according to their brightness in the x-ray wavelengths. There are three categories:
X-class flares are big; they are major events that can trigger radio blackouts around the whole world and long-lasting radiation storms in the upper atmosphere.
M-class flares are medium-sized; they generally cause brief radio blackouts that affect Earth’s polar regions. Minor radiation storms sometimes follow an M-class flare.
Compared to X- and M-class events, C-class flares are small with few noticeable consequences here on Earth.