Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1451s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1451
Other
2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms
Scientific paper
The magnetotail thin current sheet is the site of storage and release of magnetic energy through magnetic reconnection and thus plays a key role in solar wind - magnetosphere coupling. It has a charcateristic thickness of the order of the ion gyro radius and consequently the plasma equilibrium is essentially kinetic nature. The plasma processes of reconnection have a wide range of scales, from the electron gyro radius to the MHD scales and modeling the multiscale phenomenon requires realistic models of the magnetotail. One of the important features of the magnetotail is the asymmetry between the dipolar field earthward and the tail- like field downstream. The two-dimensional kinetic equilibria of the current sheet are obtained from the Grad- Shafranov eqution derived by using the total energy and the canonical momentum as the constants of motion. This equation is highly nonlinear and yields two types of solutions, often referred to as the shallow and deep solutions, corresponding to the current sheet and magnetic islands, respectively. By using a simulation box with boundary conditions corresponding to the dipole-like field on earthward side and open flow conditions on the other, a set of equilibria with current sheets and islands are obtained. These equilibria provide a way of representing the transition from the thin current sheet to the magnetic islands. These equilibria are used as the initial conditions for particle-in-cell simulations of the magnetotail, and yield the micro and mesoscale features.
Malova Helmi
Sharma Sanjeev
Stark Daniel
Zelenyi Lev
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