Adv. Radio Sci., 16, 1–11, https://doi.org/10.5194/ars-16-1-2018,https://doi.org/10.5194/ars-16-1-2018, 2018
This paper gives a brief overview over the International Reference Ionosphere (IRI) project and model. IRI is recognized as the official standard for the ionosphere by the International Standardization Organization (ISO). Of great importance are the external drivers of the model that help IRI to represent ionospheric conditions as realistically as possible. The paper discusses the solar and ionospheric measurements that are used as drivers and presents recent improvements and changes.