Aeronomic and Dynamic Correction of the Global Model GTEC for Disturbed Conditions

What is it about?

An aeronomic and dynamic correction of the GTEC median global model of the total electron content for disturbed conditions (Ap ≥ 15 nT) is proposed. The GTEC global median model is developed for quiet conditions (Ap < 15 nT) as a function of the geographic coordinates, universal time UT, day of the year, and solar activity level (the solar radio emission f lux F10.7). The model is based on a spherical harmonic analysis of the GIM-TEC Global Ionospheric Maps (1996-2019) provided by the Jet Propulsion Laboratory (NASA). The proposed GDMTEC global dynamic model (Global Dynamic Model of TEC) consists of the GTEC median model updated with several dynamic and aeronomic corrections related to formation of the main ionospheric trough, position of the auroral ionization maximum and changes of the thermospheric temperature and composition. The advantage of the proposed corrections of the median model is the independence of forecast of the data in real time from assimilation of the current observational data. Testing of the model for disturbed conditions shows an improvement of the forecast compared to the IRI-Plas ionospheric reference model.

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