Ionosphere Dynamics and Applications GEOPHYSICAL MONOGRAPH SERIESSpace Physics and Aeronomy CollectionIonosphere Dynamics and ApplicationsIts more than a century since scientists first identified the ionosphere the layer of the Earths upper atmosphere that is ionized by solar and cosmic radiation. Our understanding of this dynamic part of the nearEarth space environment has greatly advanced in recent years thanks to new observational technologies improved numerical models and powerful computing