Monitoring Ionospheric Behaviors Using Models Derived from Observations GNSS Satellites

In order to Ionospher behavior monitoring and obtain periodic Ionospher global range, spectral analysis on data models that contain Ionospher TEC values are carried. These ionospheric models are obtained from processing of dual GNSS receivers data. These maps cover the whole earth, and consist of 73 × 71 points. According to data of over 12 years, 152 days of 1998 to the last day of 2010, the suitable time series for processing on a regular network is producedSpectral analysis was performed on the time series and main periodic ranges are calculated. The main periodic ranges: the period of the third day, half daily, daily, 27- daily, quarterly, half-yearly, annual and 3/11 years old. The relation between these periodic ranges with phenomena such as periodic and translational motions of Earth and its magnetic fields, and the solar activity is clear. On the other hand, some periodic ranges are calculated that there are no good physical reasons for them. However, this component could be due to clutter spectrum of data in Spectral leakage. In order to understand the behavior and the changes in periodic ranges, the profiles of their normalized spectra are studied in points with same latitude or longitude.