2.6.0 spase://ISWI/NumericalData/RION/GIRO/IRTAM/PT15M Ionospheric electron densities derived from the IRTAM 3D global real-time assimilative model 2023-12-27T16:02:27 IRI-based Real-Time Assimilative Model (IRTAM) is a collection of global 3D ionospheric electron density (Ne) computations produced every 15 minutes to follow the timeline of the ionospheric weather dynamics. IRTAM 3D belongs to a class of "assimilative IRI" models that replace the internal coefficients of International Reference Ionosphere (IRI), an empirical quiet-time model of ionospheric climate with updated coefficients that are obtained by smoothly transforming ("morphing") IRI into agreement with available observations. The observations are provided in near-real-time by Global Ionosphere Radio Observatory (GIRO) ionosondes. IRTAM 3D is a 4DVAR assimilative model whose single computation provides the best fit of the model to 24-hour history window of observations prior to analysis time. Its underlying formalism of representing Ne distributions is the same as in IRI: a set of 2D surface maps are computed to obtain the "anchor" points of the 1D vertical extent of Ne at any location and time. Heavy investments of time, effort, expertise, and funds continue to be made to produce, collect, quality control, interpret, and archive ionosonde data. It is therefore important that the data suppliers and Lowell GIRO Data Center (LGDC) are appropriately acknowledged in scientific publications that include analysis of data obtained from LGDC servers. Please read Rules of the Road https://giro.uml.edu/didbase/RulesOfTheRoad.html for license information and refer to Acknowledgements List https://giro.uml.edu/didbase/acknowledgements.htm to use GIRO data per license requirements. spase://SMWG/Person/Bodo.W.Reinisch PrincipalInvestigator spase://SMWG/Person/Ivan.A.Galkin TechnicalContact spase://SMWG/Person/Leonard.N.Garcia MetadataContact IRTAM 3D Landing Page https://giro.uml.edu/IRTAM/ spase://ISWI/Repository/UML/DIDBase GAMBIT Landing Page https://giro.uml.edu/GAMBIT/ Global Assimilative Model of Bottomside Ionosphere Timeline (GAMBIT) is an online database of the global ionospheric weather nowcast by IRTAM 3D (IRI-based Real-Time Assimilative Model). IRTAM 3D uses real-time measurement feeds from GIRO (Global Ionosphere Radio Observatory). GAMBIT holds both real-time and retrospective IRTAM results. Text.ASCII spase://ISWI/Instrument/GIRO/Ionosonde Waves.Active 1987-01-01T00:00:05Z PT5M PT15M RadioFrequency Earth.NearSurface.Ionosphere Ionogram