WIonosphere
WBirkeland current
WIonosphere
WEquatorial electrojet
WGeomagnetic storm
WHigh-frequency Active Auroral Research Program
WInternational Reference Ionosphere
WIonized-air glow
WIonosonde
WIonospheric absorption
WIonospheric pierce point
WSkywave
WIonospheric storm
WKennelly–Heaviside layer
WMagnetosphere
WSchumann resonances
WSkywave
WSporadic E propagation
WTIMED
WTotal electron content
WWhistler (radio)