Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53a1422t&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM53A-1422
Other
2724 Magnetopause And Boundary Layers, 2764 Plasma Sheet, 7835 Magnetic Reconnection (2723, 7526), 7845 Particle Acceleration, 7846 Plasma Energization
Scientific paper
Magnetic reconnection in the plasma universe is widely known as one of the important processes by which electromagnetic energy is converted into plasma kinetic/thermal energy. The existence of fast plasma outflows in association with the magnetic reconnection has been observed both in the magnetopause (MP) and in the magnetotail (MT). Structure of the MP is completely different from that of the MT. In the MP, the plasma density of the magnetosheath side is higher than that of the magnetospheric side. On the other hand, in the MT, the plasma densities of the northern and the southern hemisphere are usually thought to be symmetric. In the present study, we have investigated the dependence of the electron dynamics on a reconnection layer structure with density asymmetric current sheet. Two-dimensional (2-D) particle-in-cell (PIC) simulations with GEM-like perturbations have been used to see the nonlinear phase of the tearing mode in an extended single X-line structure. In order to do this survey, two key parameters of nlow and nhigh are systematically varied, where nlow and nhigh are the plasma densities at each lobe side. One asymmetric current layer (nlobe = nlow, nhigh) is compared to two different symmetric current layers, that is, the current layers with low lobe plasma density (nlobe = nlow, nlow) and with high plasma density (nlobe = nhigh, nhigh). It is found that in the asymmetric case, the Hall magnetic field of the high-density side penetrates into the low-density side. It is also found that the electron energization is controlled by the high-density lobe plasma.
Fujimoto Minoru
Shinohara Iku
Tanaka Kenny G.
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