< SWACI Products

Small scale irregularities of the ionospheric plasma may cause fluctuations of the signal strength of radio waves.
The S4-Index is a measure to describe the amplitude- respectively the intensity fluctuations of a signal.
The σ_φ-Index, describes the behaviour of GPS-carrier phase fluctuations.
Both indices are calculated over a one minute interval.

DLR’s high rate GNSS measurement network ranges from Near Polar to equatorial latitudes. The measurements are provided in near real time by DLR’s Experimentation and Verification Network (EVnet)[Noack et al., 2004,2005]. We thank the hosting institutes for supplying the required infrastructure.

Kiruna (67.84°N; 20.41°E)

Neustrelitz (53.32°N; 13.07°E)

Laguna (28.47° N; -16.32° E)

Toulouse (43.57° N; 1.47° E)