Radiation Belt Drift Shell Modeling for Real-Time and Long Duration Applications: L* a Million Times Faster

Details Radiation Belt Drift Shell Modeling for Real-Time and Long Duration Applications: L* a Million Times Faster Radiation Belt Drift Shell Modeling for Real-Time and Long Duration Applications: L* a Million Times Faster

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11a1582k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11A-1582

Physics

2740 Magnetospheric Configuration And Dynamics, 7959 Models

Scientific paper

Radiation belt modeling and forecasts require accurate calculations of particle drift shells and their spatial/temporal variation which is commonly represented by the third adiabatic invariant, L*. These calculations in realistic geomagnetic fields typically involve three-dimensional numerical integration of the global field. For recent, empirical magnetic field models it can take a long time to calculate L* particularly using more sophisticated models [McCollough et al., 2008]. Because of these long computing times, researchers tend to pick simplistic models over more accurate ones risking large inaccuracies and even wrong conclusions [Huang et al., 2008]. Real-time radiation belt modeling and forecasting requires efficient algorithms without sacrifice of numerical accuracy. Likewise, long-duration calculations (e.g. solar-cycle scales) are impractical when finite element integrations are applied. We will present a newly developed method for calculating accurate L* values up to 106 times faster than the standard integration and interpolation technique. While the technique is applicable for any closed drift shell, we will present results of a detailed validation at geosynchronous orbit where there is extensive data for independent tests of accuracy. We will also present results from validating our prototype against various empirical field models including the TSK03 model [Tsyganenko et al., 2003].

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