Radial Diffusion as a Potential Source and Loss Mechanism of Relativistic Electrons in the Outer Radiation Belt

Details Radial Diffusion as a Potential Source and Loss Mechanism of Relativistic Electrons in the Outer Radiation Belt Radial Diffusion as a Potential Source and Loss Mechanism of Relativistic Electrons in the Outer Radiation Belt

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm51d..06s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM51D-06

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The loss mechanisms responsible for the sudden depletions of the outer electron radiation belt are examined based on observations and radial diffusion modeling. SAMPEX data for October-December 2003, indicates that depletions are correlated with increases in geomagnetic activity and also correlated with sudden increases in the solar wind dynamic pressure. Multi-channel HEO observations show that depletions are seen at energies as low as a few hundred keV. For the same events high energy proton channels also show decrease in fluxes at higher L-values. These observations are consistent with outward radial diffusion driven by the loss to magnetopause. We further examine the viability of the outward radial diffusion loss by comparing CRRES observations with a radial diffusion model simulations. Model-data comparison shows that flux variation near geosynchronous orbit can be effectively propagated by the outward radial diffusion to lower L-values and can account for the main phase storm depletions. The presence of the outward radial diffusion rises an important question: What is the origin of the relativistic electrons at geosynchronous orbit plasma sheet or radiation belts?

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