Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23b2046m&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM23B-2046
Physics
Plasma Physics
[2790] Magnetospheric Physics / Substorms, [7835] Space Plasma Physics / Magnetic Reconnection
Scientific paper
Dynamic process of magnetic reconnection is systematically investigated through a Hall MHD simulation. It is found that in the early phase of the magnetic reconnection, the geometry of the magnetic field in the near reconnection region tends to form a Y-type structure for a weak Hall case instead of to exhibit an X-type structure in a strong Hall case. The maximum reconnection rate in the early stage is proportional to the square of the ion inertial length (gamma d_i^2). In the late phase, the thin elongated current sheet associated with the Y-type geometry of the magnetic field breaks-up to form a magnetic island due to the secondary tearing instability. The onset time of the secondary tearing instability is inversely dependent on the square root of the ion inertia length (tau_onset (d_i)^-1/2). After the onset of the secondary tearing mode, the geometry of magnetic field near the reconnection region becomes an X-type structure and the reconnection rate substantially increases. With a strong Hall effect, the maximum reconnection rate linearly increases with the increase of the ion inertial length. A possible application of the second tearing mode instability and island coalescences in the magnetotail is presented.
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