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Discrepancies between predicted and final IGS ionospheric maps in the Northern Adriatic region

The IGS VTEC maps represent a reliable source of ionospheric information in areas where TEC dynamics cannot be measured directly. Among various IGS products, predicted and measured VTEC are given on daily basis in corresponding standardised data formats. The aim of this research was the study of ionospheric dynamics in the Northern Adriatic region based on provided VTEC maps. VTEC dynamics, both predicted and measured, were gathered during year 2012. Daily VTEC dynamics were analysed, introducing existence of three types of prevalent daily VTEC patterns. The local daily patterns were detected both with predicted and measured VTEC maps, although particular pattern and value differences were observed. Differences (residuals) between predicted and measured VTEC values in 2012 for all 366 days were calculated. Residual values were analysed and compared with solar and geomagnetic activity, aiming at possible relation between space weather events and residual values’ patterns. Depending on season and daily patterns, residuals can be obtained and predicted VTEC behaviour can be corrected. In relation to daily VTEC fluctuations with space weather activity, season and daytime, predicted VTEC values could be improved for predicting GPS position errors within considered area.

Global Positioning System; International GNSS Service; Ionospheric VTEC maps; Total Electron Content; Northern Adriatic region

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