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 in Earth’s orbit of 10 nanowatts per square meter. When moving to the next letter, the power increases 10 times. Flares are usually accompanied by emissions of solar plasma, clouds of which, reaching the Earth, can provoke magnetic storms.