Which of the following indicates the greatest solar flare intensity?
Class A
Class Z
Class M
Class X✓الإجابة الصحيحة
الشرح
These eruptions are graded A, B, C, M, and X by peak soft X-ray flux, each letter a factor of ten above the one before it, so X denotes the most intense flares. There is no Class Z, and Class M is one full decade below Class X.