Comparisons of the NRL SAMI3 Physics-Based Ionospheric Model with Global Ionosonde, GPS, and COSMIC Electron Density Measurements

Details Comparisons of the NRL SAMI3 Physics-Based Ionospheric Model with Global Ionosonde, GPS, and COSMIC Electron Density Measurements Comparisons of the NRL SAMI3 Physics-Based Ionospheric Model with Global Ionosonde, GPS, and COSMIC Electron Density Measurements

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41b1859s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41B-1859

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2447] Ionosphere / Modeling And Forecasting, [2467] Ionosphere / Plasma Temperature And Density, [2499] Ionosphere / General Or Miscellaneous

Scientific paper

The Naval Research Laboratory is conducting an interdisciplinary physics-based space weather model development and validation program called the Integrated Sun-Earth System for the Operational Environment (ISES-OE). As part of this program, for validation, numerous runs of the physics-based SAMI3 model have been made and compared to global measurements of electron density. The data sets includes: 1) Ionosonde foF2 and hmF2 measurements, 2) GPS Total Electron Content (TEC) measurements, and 3) COSMIC GPS occultation measurements. The comparisons presented will primarily center on Feb. 19 - April 19, 2008 which contains the most recent Whole Heliospheric Interval (WHI). This time period, during solar minimum, has only very modest solar activity and is a good test to validate the SAMI3 simulations of the base-state ionosphere. The results indicate that the SAMI3 has too much plasma in the topside ionosphere and too little in the bottomside ionosphere. We are investigating the possible causes this discrepancy. One possibility is that the atmosphere is more contracted than would be expected for the historically quite solar minimum conditions during the 2008 WHI. The NRLMSISE atmospheric model used in SAMI3 is an empirical model based on measurements, but there are no data for the F10.7 levels seen during this interval. We will report on the effects that exospheric temperature, electron production and loss rates, and neutral winds have on the ability of SAMI3 to correctly match the global electron density data sets. Acknowledgements: This work has been supported by the U.S. Office of Naval Research.

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