Solar Cycle 25 is at or near its peak in late 2026 - making space weather more relevant for polar route ops, GPS approaches, and every IFR preflight than it has been in over two decades.
Solar flares, solar particle events, and geomagnetic storms directly affect where commercial airliners fly, what communications work, and how accurate GPS remains at altitude.
Pilots at cruise altitude absorb 100–200× the sea-level cosmic radiation dose - the FAA's free CARI-7A tool quantifies it, and polar routes change the math significantly.