JPL/USC GAIM: On the impact of using COSMIC and ground-based GPS measurements to estimate ionospheric parameters

...Assimilating these GPS observations into the model can largely improve the ionospheric electron density estimation, which is important for ionospheric weather nowcasts and forecasts [e.g., Angling, 2008; Komjathy et al., 2010; Pi et al., 2009; Scherliess et al., 2009]...
...These models also tried to assimilate COSMIC observations, and all the results show a positive effect of COSMIC RO observations by independent validation [e.g., Angling, 2008; Komjathy et al., 2010; Pi et al., 2009; Scherliess et al., 2009]...
...Komjathy et al. [2010] found that assimilating the COSMIC measurements into the GAIM improves critical ionospheric parameter estimation and produces higher‐accuracy EDP shape and vertical TEC...

...Copyright 2011 by the American Geophysical Union 1o f14 spheric data assimilation [Komjathy et al., 2010; Pi et al., 2009; Scherliess et al., 2009; Yue et al., 2011]...
...Through assimilating the COSMIC slant TEC into JPL/USC‐GAIM, Komjathy et al. [2010] found better improvements in NmF2, hmF2, and vertical TEC specifications than only using ground based observations...
...As described in the introduction section, LEO based observations especially COSMIC observations have shown great potential in ionospheric nowcast, ionospheric drivers estimation, and short‐term forecast [Bust et al., 2007; Komjathy et al., 2010; Pi et al., 2009; Scherliess et al., 2009; Yue et al., 2011]...
...All these direct measured or indirect retrieved ionospheric parameters have shown significant value in the past decade on the monitoringandscientificresearchofionosphericweather,which is an important part in space weather [Coster and Komjathy, 2008; Hajj et al., 2000; Jakowski et al., 2007; Komjathy et al., 2010; Pedatella et al., 2009]...

...To achieve this we will reconstruct ionospheric electron density using the JPL/USC GAIM model with assimilating both ground GPS and COSMIC data (see details on this approach by Komjathy et al. [2010])...

...With the addition of the vertically resolved occultation data, the retrieved profile shapes represent the hour‐to‐hour ionospheric weather much more accurately[Komjathy etal., 2010]...

...Recently, however, ionosphere data assimilation models have gained prominence because of their ability to provide both reliable reconstructions of the global ionosphere and the self-consistent ionospheric drivers (Schunk et al., 2004a; Scherliess et al., 2004; Bust and Cowley, 2007; Komjathy et al., 2010)...

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