IRIMODEL.org (access to latest model versions)
The International Reference Ionosphere (IRI) is an international project sponsored by the Committee on Space Research (COSPAR) and the International Union of Radio Science (URSI). These organizations formed a Working Group in the late sixties to produce an empirical standard model of the ionosphere, based on all available data sources (charter). Several steadily improved editions of the model have been released. For given location, time and date, IRI describes the electron density, electron temperature, ion temperature, and ion composition in the altitude range from about 50 km to about 2000 km; and also the electron content. It provides monthly averages in the ionosphere for magnetically quiet and disturbed conditions. The major data sources are the worldwide network of ionosondes, the powerful incoherent scatter radars (Jicamarca, Arecibo, Millstone Hill, Malvern, St. Santin), the ISIS and Alouette topside sounders, and in situ instruments on several satellites and rockets. IRI is updated yearly during special IRI Workshops (e.g., during COSPAR general assemblies). More information can be found on the IRI homepage at irimodel.org.
Fortran source code through IRIMODEL.org
Several extensions are planned, including models for the ion drift, description of the auroral and polar ionosphere, and consideration of magnetic storm effects. * Online computation and plotting through CCMC modelweb interface (2016 model version)
* Online computation and plotting through CCMC modelweb interface (2012 model version)
* Online computation and plotting through CCMC modelweb interface (2007 model version)