Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31a1682b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31A-1682
Astronomy and Astrophysics
Astrophysics
2723 Magnetic Reconnection (7526, 7835), 2772 Plasma Waves And Instabilities (2471), 7500 Solar Physics, Astrophysics, And Astronomy, 7524 Magnetic Fields
Scientific paper
The magnetic reconnection process has a key-role in plasma physics. Though being over-studied for decades, there are several aspects of this fundamental mechanism that remain unclear. Nevertheless, magnetic field line reconnection is often invoked to explain in part or completely the complex evolution of several astrophysical and heliospheric structures. In particular, fast reconnection mechanisms are required in a huge variety of phenomena, for instance in solar explosive processes where erupting prominences, c.m.e.s' onset and flares' emissions are different actors in a unique scenario where reconnection plays a critical role. A strong interest is focused on the conditions for the transition between different reconnection regimes: in particular, the evolution of a current-sheet can enter a stage where the same process repeats over and over leading to a turbulent phase with the development of small scale structures interacting each other, or to a possible scale-free fractal reconnection process. This work presents a numerical analysis of such a picture in the MHD approximation where an initial current-sheet equilibrium configuration is considered and its dynamics is followed throughout the formation and the interaction of reconnection jets. The evolution of the system is observed to be driven from the initial condition through several states to a final chaotic configuration. The model is hence applied to different structures observed in the solar atmosphere.
Bettarini Lapo
Lapenta Giovanni
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