A split in the outer radiation belt by magnetopause shadowing

Details A split in the outer radiation belt by magnetopause shadowing A split in the outer radiation belt by magnetopause shadowing

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1585s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1585

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

We developed Geospace Environment Modeling System for Integrated Studies - Radiation Belts (GEMSIS-RB) code at Nagoya University, which is a relativistic test particle simulation code in the terrestrial magnetosphere. The GEMSIS-RB code uses time-varying magnetic field calculated from Tsyganenko model (TS05) with observed solar wind data and the Dst index, and simulates time evolution of the outer radiation belt in the magnetic field. In this study GEMSIS-RB calculations focused on drift loss of relativistic electrons by magnetopause shadowing (MPS). A split was found in the outer radiation belt after MPS occurs. Isolated electrons outside of the split have a narrow pitch angle distribution around 90 degree and are confined to a narrow range of the L-shell. The existence of the isolated electrons depends on the large geomagnetic tilt angle. These findings indicate that the split can be seen during the summer and winter after MPS occurs. The GEMSIS-RB calculations suggest that this split in the outer radiation belt is evidence that MPS actually causes the loss of the outer radiation belt.

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