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

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...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2022-12, Vol.62 (Suppl 1), p.S74-S86
Main Authors: Shubin, V. N., Gulyaeva, T. L., Deminov, M. G.
Format: Article
Language:English
Subjects:
Auroral ionization
Dynamic correction
Dynamic models
Earth and Environmental Science
Earth Sciences
Fourier analysis
Geographical coordinates
Geophysics/Geodesy
Harmonic analysis
Ionization
Ionospheric models
Ionospheric trough
Modelling
Solar activity
Solar radio emission
Spherical harmonics
Total Electron Content
Universal time
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Summary: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 flux F 10.7). 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.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793222600667