Operational Impacts

Aircraft on polar routes can lose high-frequency radio contact during solar radio blackouts and are exposed to raised radiation levels during solar particle events, sometimes forcing flights to divert to lower latitudes.

Satellite navigation signals pass through the ionosphere, and when solar flares and geomagnetic storms disturb it the signals are delayed and scattered, degrading positioning accuracy — a serious concern for aviation, surveying, and precision agriculture.

Radiation is one of the central hazards of human spaceflight. A large solar particle event can deliver a dangerous dose to astronauts, especially beyond the protection of Earth's magnetic field, and crews may need to shelter in more shielded parts of a spacecraft.

Geomagnetic storms drive currents in the ground that flow into long transmission lines — geomagnetically induced currents — which can saturate and damage transformers and, in severe cases, cause regional blackouts. The 1989 Québec blackout is the classic example.

The X-rays from a solar flare suddenly increase the ionisation of the day-side ionosphere, absorbing high-frequency radio waves and causing radio blackouts across the sunlit Earth — the effect measured by NOAA's R-scale.

Spacecraft are exposed to the full force of space weather: energetic particles charge their surfaces and interiors and flip bits in their electronics, while geomagnetic storms heat and expand the upper atmosphere, increasing drag and pulling low-orbit satellites down faster.