2.6.0 spase://ISWI/Model/RION/IRTAM/IRI.RealTime.Assimilative.Model IRI Real-Time Assimilative Model (IRTAM) 3D of global ionospheric electron density 2023-07-28T13:56:36 2023-10-27T19:02:00 Moved IRTAM SPASE description from a Service to a Model. Added PriorID and Model description elements. LNG. 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.html 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 Realistic Ionosphere (RION) https://iswi-secretariat.org/home-page/projects/realistic-ionosphere-rion/ A listing of the elements of the RION project with access links and references. Global Near-Real-Time F2-layer Critical Frequency and Peak Height https://giro.uml.edu/IRTAM/ The IRTAM 3D landing page has the latest animated images of the latest 24-hour IRTAM 3D computations. Global Assimilative Model of Bottomside Ionosphere Timeline (GAMBIT) https://giro.uml.edu/GAMBIT/ The GAMBIT landing page has the list of LGDC data resources (numerical, display) and documentation for accessing IRTAM 3D collection. GAMBIT is an online database of the global ionospheric weather nowcast by IRTAM 3D. IRTAM 3D uses real-time measurement feeds from GIRO (Global Ionosphere Radio Observatory). GAMBIT holds both real-time and retrospective IRTAM results. spase://ISWI/Service/RION/IRTAM/IRI.RealTime.Assimilative.Model Global Assimilative Model of Bottomside Ionosphere Timeline (GAMBIT) https://giro.uml.edu/GAMBIT/ The GAMBIT landing page has the list of LGDC data resources (numerical, display) and documentation for accessing IRTAM 3D collection. GAMBIT is an online database of the global ionospheric weather nowcast by IRTAM 3D. IRTAM 3D uses real-time measurement feeds from GIRO (Global Ionosphere Radio Observatory). GAMBIT holds both real-time and retrospective IRTAM results. Text.ASCII Empirical