Reanalysis of Radiation Belt Electron Phase Space Density Using CRRES and Akebono Observations

Details Reanalysis of Radiation Belt Electron Phase Space Density Using CRRES and Akebono Observations Reanalysis of Radiation Belt Electron Phase Space Density Using CRRES and Akebono Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1653n&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1653

Other

7839 Nonlinear Phenomena (4400, 6944), 7845 Particle Acceleration, 7867 Wave/Particle Interactions (2483, 6984), 7868 Wave/Wave Interactions, 7984 Space Radiation Environment

Scientific paper

Knowledge of the radial profile of the electron phase space density (PSD) is essential for understanding and quantifying the dynamical evolution of the radiation belts. However, such radial PSD information is difficult to obtain since space-borne observations are limited to a single point in space and may depend on the accuracy of the instrument and the accuracy of the magnetic field model. As a potential solution to the above problem, data assimilation technique provides algorithms which can allow us blend incomplete and inaccurate data with physics based dynamical model. To estimate the accuracy and to verify the results of data assimilation, in this study we perform reanalysis of the radial profile of PSD using two independent data sources from the nearly equatorial CRRES MEA observations and the polar-orbiting Akebono measurements for a 50-day period starting on 18 August 1990. In this study we use the UCLA 1D VERB code and a Kalman filtering approach. Comparison of the reanalyses shows that robust peaks in PSD are present in both of the reanalyses, and that the dynamics of the PSD obtained with data assimilation using CRRES and Akebono compare favorably to each other. In particular reanalyses show favorable agreements in the locations and magnitudes of PSD peaks and the magnitudes and radial extent of the decays. Our study not only further confirms the advantage of data assimilation technique in capturing a complete and reasonable picture of the radiation belts but also suggests an important tool for inter-calibration of satellites.

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