Instabilities Driven by Ion Shell Distributions in the Plasma Sheet Boundary Layer

Details Instabilities Driven by Ion Shell Distributions in the Plasma Sheet Boundary Layer Instabilities Driven by Ion Shell Distributions in the Plasma Sheet Boundary Layer

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm11a1163l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM11A-1163

Physics

7843 Numerical Simulation Studies, 7871 Waves And Instabilities

Scientific paper

Recent Cluster satellite observations made in the Earth's plasma sheet boundary layer region have shown the presence of ion shell distributions coincident with broadbanded electrostatic waves. The shell distributions are observed as a field-aligned beam with a perpendicular thermal spread and are related to velocity dispersed ion structures (VDIS). We have examined ion shell instabilities in the presence of a cold ion and electron background using a magnetized 2-1/2D electrostatic particle in cell code with full dynamics ions for both the energetic shell and cold background, and guiding center electrons with full parallel dynamics. Second order accurate time integration of the ion and electron orbits is achieved through a centered combination of leapfrog and mid-point trapezoidal predictor-corrector methods. Preliminary results from the numerical simulations indicate that a combination of lower hybrid waves and ion Bernstein modes are excited accompanied by electron energy gain parallel to the ambient magnetic field as well as cold ion heating in both the parallel and transverse directions. The shell distribution tends to smear in velocity due to the wave-particle interactions. Simulation results will be compared with relevant Cluster particle and wave observations.

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