The biggest solar X-ray flare ever is classified as X28

Solar flare - 4 November 2003
Click on image to see the huge flare produced on 4 November 2003
6 November 2003

It has 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.

Copyright 2000 - 2014 © European Space Agency. All rights reserved.