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Record Search Query: ServiceParameters>MODELS>EARTH SCIENCE REANALYSES/ASSIMILATION MODELS

Utah State University Global Assimilation of Ionospheric
Measurements (USU-GAIM) Model
Entry ID: GAIM
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Summary
Abstract: Physics-based data assimilation models of the ionosphere were developed at
Utah State University as part of a DoD Multidisciplinary University Research
Initiative (MURI) program. The USU effort was called Global Assimilation of
Ionospheric Measurements (GAIM). One of the USU data assimilation models is
now available at the CCMC for use by the scientific community. This model is a
Gauss-Markov Kalman Filter (GMKF) model, and it uses a physics-based model of
the ionosphere and a Kalman filter as a basis for assimilating a diverse set
of real-time (or near real-time) measurements. The physics-based model is the
Ionosphere Forecast Model (IFM), which is global and covers the E-region,
F-region, and topside from 90 to 1400 km. It takes account of five ion
species (NO+, O2+, N2+, O+, H+). However, the main output of the model is a
3-dimensional electron density distribution at user specified times. In
addition, auxiliary parameters are also provided, including NmE, hmE, NmF2,
hmF2, slant and vertical TEC. The Gauss-Markov Kalman Model assimilates
bottom-side Ne profiles from a variable number of ionosondes, slant TEC from a
variable number of ground GPS/TEC stations, in situ Ne from four DMSP
satellites, and line-of-sight UV emissions measured by satellites. Quality
control algorithms for all of the data types are provided as an integral part
of the model and the model takes account of latent data (up to 3 hours). With
the GMKF model the ionospheric densities obtained from the IFM constitute a
background ionospheric density field on which perturbations are superimposed
based on the available data sources and their errors. The density
perturbations and the associated errors evolve over time via a statistical
Gauss-Markov process.

Related URL
Link: GET DATA
Description: View Ionosphere Models Simulation Results.

Link: GET DATA
Description: GPS RINEX Data from the SOPAC Data Archive.

Link: GET SERVICE
Description: Request a run of the GAIM model.
Service Citation
Originators: R.W. Schunk, L. Scherliess, J.J. Sojka, D.C. Thompson and L. Zhu
Title: Utah State University Global Assimilation of Ionospheric Measurements (USU-GAIM) Model
Provider: Community Coordinated Modeling Center
URL: http://ccmc.gsfc.nasa.gov/models/modelinfo.php?model=USU-GAIM
ISO Topic Category
GEOSCIENTIFIC INFORMATION
Service Provider
Community Coordinated Modeling Center, Geospace Physics Lab, Heliospheric Science Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

Service Provider Personnel
Name: MICHAEL HESSE
Phone: 301-286-8224
Fax: 301-286-1648
Email: Michael.Hesse at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 674.0
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Distribution Media
Distribution_Media: Online
Personnel
MARIA KUZNETSOVA
Role: TECHNICAL CONTACT
Phone: 301-286-9571
Email: Maria.M.Kuznetsova at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 674.0
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

DON THOMPSON
Role: TECHNICAL CONTACT
Phone: (435)-797-2357
Email: thompson at gaim.cass.usu.edu
Contact Address:
Center for Atmospheric & Space Sciences
Utah State University
City: Logan
Province or State: Utah
Postal Code: 84322-4405
Country: USA

TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Creation and Review Dates
SERF Creation Date: 2006-08-14
SERF Last Revision Date: 2008-06-04
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