Particle Energization in Cusp-Like Diamagnetic Cavities

Details Particle Energization in Cusp-Like Diamagnetic Cavities Particle Energization in Cusp-Like Diamagnetic Cavities

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm33a1546b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM33A-1546

Physics

Plasma Physics

[2706] Magnetospheric Physics / Cusp, [2720] Magnetospheric Physics / Energetic Particles: Trapped, [2753] Magnetospheric Physics / Numerical Modeling, [7845] Space Plasma Physics / Particle Acceleration

Scientific paper

Acceleration of charged particles is of fundamental importance in many space and astrophysical plasma systems. Particularly controversial is the observation of energetic particles associated with cusp diamagnetic cavities. While there are indications that the acceleration of these particles occurs locally other observations seem to indicate the quasi-parallel bow shock as the source region for these particles. We examine the particle dynamics in the framework of test particle simulations using electric and magnetic field from MHD simulations of diamagnetic cavities. Our prior results indicate a high efficiency of particle acceleration. This presentation will address properties of the particle dynamics, specifically the scaling of particle energies and the access to diamagnetic regions. Adiabatic particle entry implies specific pitchangle distribution in the depressed magnetic field that appear inconsistent with recent observational results. We examine the detailed particle dynamics particularly in view of the conservation of the magnetic moment and the possibility of pitchangle scattering as a possible explanation for the observed energetic distributions in diamagnetic regions.

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