Comment Carrington Event (Score 5, Insightful) 53
Solar flares are commonly classified in terms of their Geostationary Operational Environmental Satellite (GOES) 1–8 A peak SXR (soft X-ray) intensity. The scale is C1-9 (weakest), M1-9 (middle), X1-on up (strongest). The Carrington Event is estimated at >X10 (possibly ~X15-X42). The flare on 4 November 2003, generally considered to be the most intense SXR event during the space age, with an estimated peak SXR classification ranging from ~X25-45 but did not hit us directly. The event mentioned in the article is classified as an X1 event.
Do with this data as you will.