Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.70b&link_type=abstract
"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,
Physics
Scientific paper
The complex dynamics observed in magnetic reconnection processes underlies the evolution of a huge variety of phenomena, ranging from astrophysical plasmas, such accretion discs or relativistic jets, to solar explosive processes, like chromospheric jets, c.m.e. triggering and flares, to large and small scale structures in planetary atmospheres. In particular, within the solar environment it is a good candidate also to model less dramatic mechanisms like solar wind dynamics and coronal heating. In compressible conditions, the presence of a stratified atmosphere, and so the corresponding sensitive variation of the plasma beta, does influence the onset and the evolution of the reconnecting field lines and the resulting jet formation and acceleration. This work presents a two-dimensional numerical analysis of such a picture wherein a current-sheet dynamics in a strongly stratified medium, resembling the solar atmosphere from the photospheric level up to the corona, is followed throughout the nonlinear regime and it shows the dependence of the reconnection process either on the details of the density configuration and on the mechanism triggering its onset. Starting from these results, a possible method for the diagnosis of the initiation of several solar phenomena can be suggested. A preliminary study on a multi current-sheet system evolution is considered as well and its dynamics is followed throughout the formation and interaction of the reconnection jets: such configuration can bring new light on peculiar structures like polar coronal plumes. Due to the different length scales in play, the results are obtained by a comparison of MHD and kinetic simulations.
Bettarini Lapo
Lapenta Giovanni
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