4.2
SAMI3/WACCM-X Simulations of the Ionosphere during 2009

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Tuesday, 6 January 2015: 8:45 AM
227A-C (Phoenix Convention Center - West and North Buildings)
Sarah E. McDonald, NRL, Washington, DC; and F. Sassi

To study the day-to-day effects of the lower atmosphere on the ionosphere, we have performed simulations of SAMI3, NRL's physics-based model of the ionosphere, with a one-way coupling to the extended version of the Whole Atmosphere Community Climate Model (WACCM-X). WACCM-X has a top boundary located in the upper thermosphere (2.5 10-9 hPa, or ~500 km altitude); therefore we are able to drive SAMI3 using the full profile of the WACCM-X winds. To simulate specific events, WACCM-X can be constrained by data analysis products or observations. In this study, lower atmospheric weather patterns are introduced into WACCM-X using a linear combination of NASA's MERRA and the U.S. Navy's NOGAPS data assimilation products. The SAMI3/WACCM-X simulations are performed for January, February, April, July and October 2009. The January February period is particularly interesting due to the large stratospheric warming event that occurred on 24 January 2009. We quantify the seasonal and day-to-day ionospheric variability in the thermospheric winds, E B drifts, NmF2, hmF2 and TEC during this period, and identify the tides primarily responsible for the variations.