Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13a2027g&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM13A-2027
Physics
Plasma Physics
[2712] Magnetospheric Physics / Electric Fields, [2723] Magnetospheric Physics / Magnetic Reconnection, [7815] Space Plasma Physics / Electrostatic Structures, [7839] Space Plasma Physics / Nonlinear Phenomena
Scientific paper
New 3-D implicit-PIC simulations of magnetic reconnection have been performed with emphasis on studying electric fields and nonlinear waves. The simulations are initiated with a perturbed Harris equilibrium uniform in the out-of-plane direction, both with and without a guide field. In addition to the out-of-plane EM reconnection electric field, an out-of-plane electrostatic field of roughly equal peak magnitude is found. This electrostatic field is broken-up spatially in the out-of-plane direction, probably due to turbulence. Parallel bipolar electrostatic fields (electron phase space holes) are found both along the separatrix and out-of-plane, near the x-line. Three-dimensional features of these bipolar fields are studied, including their parallel to perpendicular aspect ratios. New behavior is also found in electric field components which are perpendicular to the local magnetic field. These perpendicular fields are mainly electrostatic but their properties depend on their azimuthal angle around the magnetic field. They are decomposed into two mutually orthogonal components. In one of these directions low-frequency electrostatic waves are found to propagate almost perpendicular to magnetic field lines in the out-of-plane extension of the magnetic separatrix which divides the inflow from the exhaust. The temporal and spatial behavior of these waves is studied.
Andersson L.-L.
Goldman Martin V.
Lapenta Giovanni
Markidis Stefano
Newman D. L.
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