부산대학교 도서관

Ionosphere from the radio wave's point of view is a highly dispersive and refractive medium. Moreover it is very unstable and multiple factors dependent. Thus permanent ionospheric monitoring is very important for all applications based on the sub- and trans-ionospheric radio emissions - both scientific and industrial. The basic - diurnal, seasonal and solar cycle driven - ionospheric variability is rather well known in general, but many impossible or difficult to predict fluctuations may interfere with the radio signal on the level that would seriously affect satellite or radio astronomical systems performance.