Validation of the STORM model used in IRI with ionosonde data

The empirical ionospheric storm correction model STORM included in the new version of the IRI model is driven by the previous time-history of the ap index and is designed to be dependent on latitude and season. The behavior of this correction model has been analyzed comparing foF2 values obtained by the IRI model with or without storm correction and those measured by ionosondes distributed around the world. A statistical analysis was done using two geomagnetic storms during 2003 (medium solar activity).