Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31b1734l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31B-1734
Physics
2723 Magnetic Reconnection (7526, 7835), 7526 Magnetic Reconnection (2723, 7835), 7829 Kinetic Waves And Instabilities, 7835 Magnetic Reconnection (2723, 7526), 7839 Nonlinear Phenomena (4400, 6944)
Scientific paper
Recent full-particle simulations of pair reconnection reveal that the Weibel instability plays an active role in controlling the current layer dynamics. The anisotropy arises as inflowing plasma mixes with outflow from the x-line. A 4-beam model is proposed to capture the Weibel instability inside a narrow current layer. Due to the mass and charge symmetry between electrons and positrons, we are able to obtain two coupled 2nd order differential equations, whose growing eigenmodes are obtained via either asymptotic approximation or finite difference method. Full particle simulations are conducted to confirm our linear theory, and further explore the nonlinear behavior of the Weibel instability inside a narrow Harris sheet. The scale size of the observed structures in the outflow jet in simulations of pair reconnection is linked to the gyro-radii of high-velocity streaming particles in the Weibel-generated, out-of-plane magnetic field. The associated momentum transport helps open the reconnection nozzle downstream from the x-line.
Drake James F.
Liu Ya-Ying
Swisdak Michael
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