HR: 11:10h
AN: SA12A-03    [Abstracts]
TI: Relative Importance of Storm-Time Mechanisms in the Observed TEC Response to the March 31, 2001 Geomagnetic Storm
AU: * Fedrizzi, M
EM: Mariangel.Fedrizzi@noaa.gov
AF: Space Environment Center, NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: Fuller-Rowell, T J
EM: Tim.Fuller-Rowell@noaa.gov
AF: Space Environment Center, NOAA and CIRES, University of Colorado, 325 Broadway, Boulder, CO 80305 United States
AU: Maruyama, N
EM: naomi@ucar.edu
AF: High Altitude Observatory, NCAR, 3450 Mitchell Lane, Boulder, CO 80301 United States
AU: Codrescu, M
EM: Mihail.Codrescu@noaa.gov
AF: Space Environment Center, NOAA and CIRES, University of Colorado, 325 Broadway, Boulder, CO 80305 United States
AU: Araujo-Pradere, E A
EM: Eduardo.Araujo@noaa.gov
AF: Space Environment Center, NOAA and CIRES, University of Colorado, 325 Broadway, Boulder, CO 80305 United States
AU: Anderson, D
EM: David.Anderson@noaa.gov
AF: Space Environment Center, NOAA and CIRES, University of Colorado, 325 Broadway, Boulder, CO 80305 United States
AU: Anghel, A
EM: Adela.Anghel@noaa.gov
AF: Space Environment Center, NOAA and CIRES, University of Colorado, 325 Broadway, Boulder, CO 80305 United States
AB: The interpretation of the global state of TEC storm effects requires knowledge of electric fields, neutral winds, temperature and composition changes. Observational data, such as GPS TEC measurements, combined with a data assimilation model are ideal to reveal ionospheric structures. However, identifying, understanding and quantifying each mechanism's role in TEC variations during magnetically disturbed periods are quite difficult when only observational measurements are used. In order to understand all these physical processes, the global, three-dimensional, time-dependent, non-linear coupled model of the thermosphere, ionosphere, plasmasphere and electrodynamics (CTIPe) can be used to investigate and understand the dynamic and electrodynamic response of the global ionosphere during magnetic storms. CTIPe is a self-consistent model and solves the momentum, energy, and composition equations for the neutral and ionized atmosphere. It requires a few external drives, such as solar UV and EUV, Weimer electric field, TIROS/NOAA auroral precipitation, tidal forcing from the lower atmosphere, and penetration electric fields from the Rice Convection Model (RCM). Model results are compared to observational data to identify the relative importance of each mechanism in the ionosphere response to the March 31, 2001 geomagnetic storm.
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2435 Ionospheric disturbances
DE: 2447 Modeling and forecasting
SC: SPA-Aeronomy [SA]
MN: 2005 Joint Assembly