The NeQuick is an ionosphere electron density model that has been developed by the ARPL in collaboration with the University of Graz, Austria, and is continuously upgraded and improved. This model is widely used internationally for scientific purposes and also to determine ionospheric effects on satellite navigation and positioning systems (GNSS).
The NeQuick model has been adopted by the International Telecommunication Union, Radiocommunication Sector (ITU-R) Recommendation P. 531-9 as a suitable method for TEC modeling.
The NeQuick model has been used by the European Geostationary Navigation Overlay Service (EGNOS) of the European Space Agency (ESA) for system assessment analysis. For such objective a series of ionospheric scenarios have been created.  Our model has been adopted also as the model for ionospheric corrections in the single frequency operation of the European GALILEO satellite navigation system.
Please note that many of the features described require the paid version of fluid, which goes for $4