Sahin O.Sezen, U.Arikan F.Arıkan, OrhanAktug, B.2016-02-082016-02-082011http://hdl.handle.net/11693/28368Date of Conference: 9-11 June 2011In this study, the relation of the maximum ionization height (HmF2) and the critical frequency (FoF2) of F2 layer is examined within their parametric range through the International Reference Ionosphere extended towards the plasmasphere (IRI-Plas) model and the IONOLAB-TEC (Total Electron Content) observations. HmF2 and FoF2 are optimized using an iterational loop through Non-Linear Least Squares method by also using a physical relation constraint between these two parameters. Performance evaluation of optimization algorithm is performed separately for the cases running IRI-Plas with optimized parameters and TEC input; only with optimized parameters; only with TEC and finally with no optimized parameter and TEC input. As a conclusion, it is seen that using optimized parameters and TEC together as input produces best IRI-TEC estimates. But also using only optimized parameters (without TEC update) gives estimates with also very low RMS errors and is suitable to use in optimizations. HmF2 and FoF2 estimates are obtained separately for a quiet day, positively corrupted day, negatively corrupted day, a northern latitude and a southern latitude. HmF2 and FoF2 estimation results are compared with ionosonde data where available. This study enables the modification and update of empirical and deterministic IRI Model to include instantaneous variability of the ionosphere. © 2011 IEEE.EnglishCritical frequenciesEstimation resultsF2 layerInternational reference ionospheresIonosonde dataNon-linear least squaresNorthern latitudesOptimization algorithmsOptimized parameterPerformance evaluationPlasmasphereRMS errorsSouthern latitudesTotal electron contentTwo parameterEstimationIonosphereIonospheric measurementLeast squares approximationsOptimizationParameter estimationConference Paper10.1109/RAST.2011.5966867