Geomagnetic Storm July 2025. The sun’s magnetic field flips at the peak of these cycles, each of which lasts approximately 11 years. During a solar geomagnetic storm flare, an intense burst of radiation from the sun changes the composition and speed of the particles within the earth’s atmosphere.
The sun sometimes emits a strong surge of solar. Solar cycle 25—by far the most thoroughly observed solar cycle in history—has reached its maximum phase, nasa and the national oceanic and atmospheric administration.