Solar flares are categorized into five classes based on the intensity of X-ray emissions: A, B, C, M, and X. The minimum class, A0.0, corresponds to an emission power of 10 nW per square meter at Earth's orbit. As the classification progresses to the next letter, the intensity increases tenfold. Flares are typically accompanied by ejections of solar plasma, which, upon reaching Earth, can trigger magnetic storms.
On November 1 at 00:54 MSK (03:54 Astana time), an M9.5 flare lasting 55 minutes was recorded in the X-ray range in sunspot group 3878 (N15E26), with its intensity approaching the highest class X.