Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31b1739s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31B-1739
Physics
2723 Magnetic Reconnection (7526, 7835), 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 7827 Kinetic And Mhd Theory, 7846 Plasma Energization
Scientific paper
The energization of particles during magnetic reconnection is usually studied using kinetic model of the thin current sheet and such studies ignore the effects of the global processes affecting the diffusion region. In a new coupled kinetic-global model the self-consistent kinetic models of thin current sheets are combined with a global magnetic field (Tsyganenko et al., 2002) to obtain a magnetospheric field suitable for the study of particle distributions for different conditions. The kinetic current sheets are obtained from the kinetic Grad- Shafranov equation, which yields three types of equilibria: field-reversed (Harris) sheet, magnetotail (finite Bn) and current sheets with embedded magnetic islands. These equilibria are then embedded into the global magnetic field model to obtain an integrated magnetic field in which the kinetic nature of the thin current sheet and the overall global (MHD) features are seamlessly coupled. The particle distributions in these cases are then studied using particle-in-cell techniques. While these simulations may not yield the self- consistent evolution, they yield a very good sampling of the particle distributions under the specified conditions of the magnetotail. In simulations using initial distributions that are Gaussian the electron energization is found to be most effective in current sheets with an embedded magnetic island. Although these simulations do not directly yield the evolution of the particle distribution function during the different stages of reconnection, they represent the energization process well, within the framework of studies using neighboring equilibria. For realistic values of the mass ratios the ion energization is weak but the scaling for different mass ratios can be obtained. The integrated kinetic-global equilibria will be used for the study of instabilities responsible for reconnection onset.
Sharma Sanjeev
Stark Daniel
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