Fluctuations Effects of GPS Signals on High Latitude Transionospheric Links

The paper presents the analysis on the storm-time occurrence of phase fluctuations of GPS signals observed at high latitude ionosphere using both north and south hemisphere GPS stations. GPS phase measurements provide information about TEC variations. The fluctuations are caused by different scales ionospheric irregularities which were associated with auroral oval and polar cap. During storm intensity phase fluctuations essentially increased. The strongest fluctuations associated with polar patches which were usually observed in the polar ionosphere. During storm strong TEC fluctuations were detected at geomagnetic latitudes lower than 60N.