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Comparison of Two IRI plasmasphere Extensions with GPS-TEC ObservationsComparisons of two model results with Global Positioning System GPS-TEC measurements have been carried out for different latitudinal, solar activity, magnetic activity, diurnal and seasonal conditions. The models evaluated are the Global Core Plasma Model (GCPM-2000) and the IRI extension with Russian plasmasphere model (IRI*).Data of 23 observatories providing GPS-TEC and ionosonde data have been used. It is shown that IRI* plasmasphere electron density is greater than GCPM results by an order of magnitude at 6370 km altitude (one Earth's radius) with this excess growing to 2-3 orders of magnitude towards the GPS satellite altitude of 20000 km. Another source of model and GPS-TEC differences is a way of selection of the F2 layer peak parameters driving the models either with ITU-R (former CCIR) maps or ionosonde observations. Plasmasphere amendment to IRI improves accuracy of TEC model predictions because the plasmasphere contribution to the total TEC varies from 10% by daytime under quiet magnetic conditions to more than 50% by night under stormy conditions.
Document ID
20060048236
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Gulyaeva, T. L.
(Academy of Sciences (USSR) Troitsk, Russian Federation)
Gallagher, Dennis L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Solar Physics
Meeting Information
Meeting: International Reference Ionosphere (IRI) 2005 Workshop
Location: Roquetes
Country: Spain
Start Date: June 25, 2005
End Date: July 1, 2005
Distribution Limits
Public
Copyright
Other

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