Assessing the Sensitivity of Radiation Belt Model Predictions to Different Magnetic Field Models

Details Assessing the Sensitivity of Radiation Belt Model Predictions to Different Magnetic Field Models Assessing the Sensitivity of Radiation Belt Model Predictions to Different Magnetic Field Models

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa12a..06h&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA12A-06

Physics

2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Accurate knowledge of the time-dependent magnetic field in the inner magnetosphere is an important factor needed to simulate correctly the radiation belt environment. The dramatic change of magnetic field configuration in the inner magnetosphere, especially during magnetic storm time, could significantly alter radiation belt model predictions. Reproducing storm time magnetic field in the inner magnetosphere remains a challenge for both empirical and physics-based models. In this study, we use various field models to quantify the sensitivity of particle motions in a global field configuration for a given radiation belt model. The radiation belt model in this work is a two-dimensional test particle simulation which uses guiding center particle approximation to understand the motions of relativistic electrons [Elkington et al., 2004]. We use three different sources of magnetic field for the radiation belt model: (1) a simple dipole field, as well as magnetic field outputs from (2) the Tsyganenko storm model [Tsyganenko et al., 2003] and (3) the LFM MHD simulation [Lyon et al., 2004]. We explore the storm time evolution of radiation belt particle behavior by comparing results using different magnetic field configurations. Quantifying model sensitivity to the magnetic field will provide a general resource for radiation belt studies and will ultimately help in developing better inner magnetosphere models.

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