HR: 16:20h
AN: SH14B-02    [Abstracts]
TI: Assimilative 3D Models of Density and Temperature in the Solar Corona
AU: * Kamalabadi, F
EM: farzadk@uiuc.edu
AF: University of Illinois, 1308 W Main St., Urbana, IL 61801,
AU: Butala, M
EM: butala@uiuc.edu
AF: University of Illinois, 1308 W Main St., Urbana, IL 61801,
AU: Frazin, R
EM: rfrazin@umich.edu
AF: University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109,
AU: Chen, Y
EM: yuguo@uiuc.edu
AF: University of Illinois, 1308 W Main St., Urbana, IL 61801,
AB: White-light and extreme ultraviolet images of the solar corona, as measured routinely by a variety of dedicated space- and ground-based instruments, offer an opportunity for empirical determination of the global, 3D distribution of density and temperature in the Sun's corona. In this work, we describe a 3D model for the estimation of coronal density from polarized brightness measurements and a coronal temperature model based on differential emission measure tomography. The computational solutions of the associated inverse problems, which utilize LASCO, MK-4, and EIT measurements at different solar rotation angles, yield reliable reconstructions of persistent, large-scale structures. The characterization of transient disturbances responsible for space weather phenomena, however, demands new developments in data assimilation and statistical estimation theory. We present a state-space framework capable of dynamically estimating the time-varying state of the corona. The 3D, time-dependent nature of the estimation scheme demands algorithms that scale well with the problem size. We describe recursive estimation techniques which dramatically reduce computational complexity and enable data-assimilative global models of the solar corona. Finally, implications for data assimilation with STEREO are discussed.
DE: 0520 Data analysis: algorithms and implementation
DE: 3245 Probabilistic forecasting (3238)
DE: 3260 Inverse theory
DE: 6982 Tomography and imaging (7270, 8180)
DE: 7509 Corona
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting