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Thermosphere-Ionosphere C oupling at NRL

Thermosphere-Ionosphere C oupling at NRL. F. Sassi – NRL S.E. McDonald – NRL D. Drob - NRL J. Tate – CPI C. Metzler - NRL. McDonald et al. (2015). Overarching Questions.

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Thermosphere-Ionosphere C oupling at NRL

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  1. Thermosphere-Ionosphere Coupling at NRL • F. Sassi – NRL • S.E. McDonald – NRL • D. Drob - NRL • J. Tate – CPI • C. Metzler - NRL McDonald et al. (2015)

  2. Overarching Questions • What type of dynamics reaches the lower thermosphere and is conducive to coupling the ionosphere properties with the neutral behavior? • How is composition variability in the MLT affecting the characteristics ionospheric layers? • Is there a benefit of including weatherto improve HF radio-wave propagation? • What observational data is available for model validation on short- & long-term, and global scales? • The NRL example … U.S. Naval Research Laboratory

  3. Bottom-side Ionosphere Weather Modeling NRL-SAMI3 Solar Drivers How do environmental conditions (chemistry, solar drivers, and meteorology) affect radio-frequency wave propagation? Fe+ Na+ Ca+ K+ Mg+ H+(H2O)n O2+ NO+ FeO+ WACCM-X SAMI3 MoJo Physics-based model of the ionosphere. Dynamics and chemistry of 7 ion species from 85 km to > 20,000 km Full Coupling NAVGEM Global climate-chemistry model Solves dynamics, physics and chemistry globally from ground to ~500 km MoJo Radio-wave propagation code. Includes updated dispersion and attenuation. Capable of using observations & model data. Produces ionograms (WSBI) for verification. NAVGEM: Operational Navy Analysis (ground to ~92 km) 4DVAR Hourly data assimilation products U.S. Naval Research Laboratory

  4. Model Data Validation • How can we validate model data? • What type of datasets we need to properly validate thermosphere-ionosphere forecasts? • What time scales?

  5. TEC – Spatial Structure at LT = 14:00 JPL TEC 20 – 29 January 2010 SAMI3/SD-WACCM-X with NOGAPS SAMI3/HWM/MSIS (climatology) SAMI3/SD-WACCM-X with NAVGEM U.S. Naval Research Laboratory

  6. TEC – Daily 2-31 Jan 2010 NOGAPS-ALPHA JPL NAVGEM U.S. Naval Research Laboratory

  7. Empirical Models – Climatology Scherliess-Fejer: January SAMI3/SD-WACCM-X with NOGAPS forcing SAMI3/SD-WACCM-X with NAVGEM forcing SAMI3/HWM/MSIS (climatology) U.S. Naval Research Laboratory

  8. Vertical Structure nmF2 MODELS COSMIC U.S. Naval Research Laboratory Pedatella et al. (2016)

  9. Final Thoughts • Thermosphere-Ionosphere Interactions: • Scientific challenges: Coupling the ionosphere with the thermosphere (ztop ~ exobase) that includes weather from the lower atmosphere • Computational challenges: Achieving code efficiency and accuracy • Validation challenges: We need to validate our model simulations (!) both on short-time scales (vis a vis role of tides, migrating and non-migrating), and long-time scales (vis a vis role of composition changes). We also need global datasets. And we need a common and established way to compare models to observations. • Let’s get started with the interesting stuff … U.S. Naval Research Laboratory

  10. We thank the Chief of Naval Research for supporting this activity CEDAR

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