Ring current models: How well do they constrain the inner magnetosphere configuration?

Details Ring current models: How well do they constrain the inner magnetosphere configuration? Ring current models: How well do they constrain the inner magnetosphere configuration?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1483g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1483

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2774 Radiation Belts, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The ring current at and inside geostationary orbit is a key element that defines the magnetic configuration and therefore the plasma and energetic particle drift paths in that region. It is well known that the relativistic electron acceleration and loss processes depend on the wave activity in that region that in turn is governed by e.g. the plasmapause location which depends on the time history of the field configuration. Three ring current models are used to follow the evolution of the proton ring current during the April 21--25, 2001 storm: The ring current model combined with tracing particles numerically in the drift approximation by Ganushkina et al. [2005], the empirical model of proton fluxes in the inner magnetosphere developed by Milillo et al. [2003], and the kinetic ring current-atmosphere interaction model (RAM) by Liemohn et al. [2001]. The main focus is the effects of the electric and magnetic field models and initial particle distributions on the final energy distribution. We examine a variety of large-scale magnetic field and convection electric field models as well as substorm- associated, time-varying, smaller-scale electric fields. We find that (1) Using more realistic magnetic field models leads to reduction of the ring current content by about 30 percent; (2) Details of the global convection field have little influence on the overall ring current evolution; (3) Smaller-scale impulsive electric field have profound effects on the ring current evolution, particularly with regard to the acceleration of the higher-energy particles; and (4) In the ring current models, the choice of the initial and boundary conditions have significant effects on the modeled ring current intensity and energy spectrum.

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