Particle energization in the course of plasma-sheet bubble injection: results of RCM-E simulations

Details Particle energization in the course of plasma-sheet bubble injection: results of RCM-E simulations Particle energization in the course of plasma-sheet bubble injection: results of RCM-E simulations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41a1848y&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM41A-1848

Physics

[2753] Magnetospheric Physics / Numerical Modeling, [2764] Magnetospheric Physics / Plasma Sheet, [2790] Magnetospheric Physics / Substorms

Scientific paper

To investigate the particle energization at geosynchronous orbit during the substorm expansion phase, we present simulation results of an idealized bubble injection by using the Rice Convection Model with self-calculated equilibrated magnetic field model (RCM-E). The bubble is initiated in the near-Earth plasma sheet at X=-15 RE with severely depleted entropy parameter PV5/3 following a substorm growth phase. The simulation confirms the well-established particle injection features, including prominent dispersionless particle flux enhancement for energetic protons (>100keV) near midnight geosynchronous orbit and dispersive flux enhancement around the dusk sector. We find that dispersionless flux enhancement coincides with the magnetic field dipolarization well inside the plasma-sheet bubble and the injection boundary is overlapped with the earthward shape of the bubble. We suggest that the particles are accelerated as the magnetic field dipolarizes remarkably, which is caused by the large flux tube content reduction inside the bubble. We also find that this mechanism is more effective for higher energy particles near the transition region.

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