Radiation Belt Data-Assimilation Using Self-Consistent Storm-Time Magnetic Fields

Details Radiation Belt Data-Assimilation Using Self-Consistent Storm-Time Magnetic Fields Radiation Belt Data-Assimilation Using Self-Consistent Storm-Time Magnetic Fields

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11a1580h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11A-1580

Physics

2730 Magnetosphere: Inner, 2774 Radiation Belts, 2778 Ring Current

Scientific paper

The lack of suitably realistic magnetic field models for use in radiation belt data assimilation remains a critical unresolved problem in space weather specification and prediction. Although the high-energy radiation belt particles themselves do not significantly alter the magnetic fields in which they drift, the lower-energy ring current populations do. And the deviation (especially during storms) of the real magnetic field from that computed even with the best of the presently available empirical models can be very large. To overcome this problem, the LANL DREAM code has been modified to use magnetic fields that are self-consistently maintained in force balance with the plasma. We compare second and third adiabatic invariants computed from the self-consistent fields to those obtained with empirical B-field models, and we utilize a phase-space density matching technique in order to test the various field models. Finally, the PSD at constant mu and K in a data-assimilation model obtained with the self-consistent and non-self-consistent magnetic field models will be compared.

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