On the IRI 2007 performance as a TEC predictor for the South American sector

SCIDÁ L.A., R. G. EZQUER, M. A. CABRERA , M. MOSERT, C. BRUNINI , D. BURESOVA

Kagoshima, Japon

Workshop; IRI Workshop 2009; 2009

In order to check the model’s capability for predicting the ionospheric magnitudes, we compare TEC obtained from IRI 2007, using the two different topside options available in this model, i.e. IRI 2001-cor  and NeQuick, against measured data from GPS signals, for equinox and solstice during 1999 year. Also comparison between the two topside models have been done. The measurements were obtained at nine stations in the South American sector ranging from 18.4 to -64.7 in geographic latitude. The results show: i) Cases with good agreement between modeled and experimental values for minimum ionization hours were observed. ii) Strong disagreements in some cases for maximum ionization hours were observed. As expected, the observed discrepancy grows up as latitude increases. iii) In general, similar values with both topside model options were obtained. iv) In all the studied cases the difference between the IRI 2001-cor and NeQuick models is less  than 5 TECU.