On Friday, February 21, a near-last class M flare occurred on the Sun. This was reported by the Institute of Applied Geophysics (FSBI "IPG").
On February 21 at 15:15 Moscow time, an M3.3 flare with a duration of 14 minutes was recorded in the X-ray range.
Depending on the power of X-ray radiation, solar flares 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 nW per 1 sq. m.
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 daylight side of the Earth from a slight to moderate level.
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