Ionosphere Monitoring and Prediction Center


Norway, 77°N / 15°E (station operated by CBK PAS)

Latest Data

S4 index (GPS CA)

σΦ index (GPS L1)

Product Description

Trans-ionospheric radio signals of global navigation satellite systems (GNSS) like GPS, GLONASS, and GALILEO may suffer from rapid and intensive fluctuations of their amplitude and phase caused by small-scale irregularities of the ionospheric plasma. This phenomenon, which is called radio scintillation, can strongly disturb or disrupt the signal transmission. For technical applications it is useful to derive and to provide the well accepted S4 and σΦ indices describing the amplitude/ intensity and the phase fluctuation of a received signal, respectively. For that purpose GNSS high-rate receivers in Europe provide necessary receiver-satellite-link specific amplitude and phase information, cf.

The GSV4004 TEC and scintillation monitor, installed in Svalbard by Institute of Geophysics PAS, is a modified GPS receiver which can measure amplitude and phase of GPS signals 50 times per second. The measured data is used to compute statistical parameter S4 and phase variation every minutes. The monitor delivers also information for TEC every 15 second.

Location and coordinates of the Svalbard GNSS high-rate receivers operated by Space Research Center PAS

Station locationAbbreviation in filenameEvnet IDLatitude / Longitude / Height
Svalbard/ Norwaysv-77°N / 15°E /  m


You need an IMPC user account to access archived data. Please use the registration form to request such account.

Terms and Conditions of Use

In any case you plan to use IMPC material please consider the IMPC terms and conditions of use.