Aurora
Charged particles entering the upper atmosphere near the poles excite oxygen and nitrogen, which emit light—aurora. Higher Kp means stronger disturbance and aurora visible at lower latitudes. At Kp 7+, aurora can be seen as far south as central Europe or the northern US.
Power Grids
Geomagnetically induced currents (GIC) can flow in long power lines and transformers. In strong storms, this can stress or damage equipment, especially at high latitudes and in extended grids. Operators use forecasts to prepare and reduce risk.
Satellites and GPS
Satellites are exposed to radiation and charging during storms. Ionospheric disturbances cause GPS errors or scintillation. Radio propagation can be affected. Aviation may alter polar routes during strong events. Cosmic Radar shows Kp and space weather so you can see when effects are likely.
Sources and further reading
- NOAA – Geomagnetic storm impacts – Power, satellites, aurora
- ESA – Space weather effects – Technology impacts
- AuroraWatch UK – Aurora alerts and magnetometer data