On Tuesday, February 25, three flares of the penultimate power class M occurred on the Sun. This was reported by the Institute of Applied Geophysics (FSBI "IPG").
On February 25 at 03:01 Moscow time, an M1.5 flare lasting 18 minutes was recorded in the X-ray range in group of spots 4000 (N16W27), at 05:47 Moscow time, an M1.3 flare lasting 11 minutes was recorded in the X-ray range in group of spots 3998 (S10W42).
Also, around 2:00 AM, an M3.9 flare occurred, lasting 102 minutes. It became the most powerful of all recorded.
Solar flares, depending on the power of X-ray radiation, are divided into five classes: A, B, C, M, and X. The minimum class A0.0 corresponds to a radiation power at Earth's orbit of 10 nanowatts per square meter.
Solar flares of class M are medium flares from the so-called large ones. In total, there are five categories in their gradation. But they cause radio interference on the daytime side of the Earth from a slight to moderate level.
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