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

Abstract

An aeronomic and dynamic correction of the GTEC median global model of the total electroncontent for disturbed conditions (Ap ≥ 15 nT) is proposed. The GTEC global median model is developedfor quiet conditions (Ap 15 nT) as a function of the geographic coordinates, universal time UT, day of theyear, and solar activity level (the solar radio emission flux F10.7). The model is based on a spherical harmonicanalysis of the GIM-TEC Global Ionospheric Maps (1996–2019) provided by the Jet PropulsionLaboratory (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 toformation of the main ionospheric trough, position of the auroral ionization maximum and changes of thethermospheric temperature and composition. The advantage of the proposed corrections of the medianmodel is the independence of forecast of the data in real time from assimilation of the current observationaldata. Testing of the model for disturbed conditions shows an improvement of the forecast compared to theIRI-Plas ionospheric reference model