MOSCOW, May 10.< /strong> A new especially large X3.9 class flare occurred on the Sun, it became the fourth most powerful in the last 25 years, magnetic storms are possible on Earth on May 12-13, reported on the website of the solar astronomy laboratory of the Institute of Space Research of the Russian Academy of Sciences.
“A new, particularly large solar flare is being recorded. The event is localized in the southwestern part of the solar disk, in the same active region as previous events. The preliminary power is no less than X3.9. The event is the fourth most powerful in the current 25th solar cycle,” the message says. 
According to scientists, there are high risks of geomagnetic consequences for the Earth on May 12-13.
Solar flares, depending on the power of X-ray radiation, are divided into five classes: A, B, C, M and X.
On May 9, three powerful flares of class X and nine – class M.
Scientists previously reported that the increasing frequency of flares and the increase in their power indicate a gradual approach of the Sun to the peak of activity, which, presumably, may occur as early as mid-2024, although, according to some forecasts, it may shift and for 2025.
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