HR: 12:05h
AN: SM12B-07    [Abstracts]
TI: Optimal Estimation of Electron Lifetimes in the Outer Radiation Belt
AU: * Kondrashov, D
EM: dkondras@atmos.ucla.edu
AF: University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA 90095 United States
AU: Shprits, Y
SM12B-07 AF: University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA 90095 United States
AU: Thorne, R
SM12B-07 AF: University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA 90095 United States
AU: Ghil, M
SM12B-07 AF: University of California, Los Angeles, 405 Hilgard Ave, Los Angeles, CA 90095 United States
AU: Ghil, M
SM12B-07 AF: Département Terre-Atmosphère-Océan and Laboratoire de Météorologie Dynamique du CNRS/IPSL, Ecole Normale Supérieure, F-75231, Paris, Cedex 05 France
AU: Reeves, G
SM12B-07 AF: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545 United States
AU: Friedel, R
SM12B-07 AF: Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545 United States
AB: Data assimilation is becoming an increasingly important tool for both space weather prediction and understanding of physical processes. In this study, we demonstrate how data assimilation can help to estimate unknown parameters in a radial diffusion model. We apply "state augmentation" method and Extended Kalman filter to estimate the model's lifetime parameter of high-energy electrons by assimilating observations from CRRES satellite. Systematic variations in the estimates for this parameter are attributed to a complex nature of the competing effects of various acceleration and loss processes. Practical ways to calculate observational and model errors are demonstrated, which are critical for optimality of the Kalman filter.
DE: 2774 Radiation belts
DE: 3315 Data assimilation
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005