Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..771t&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
The satellites such as Yohkoh and RHESSI observe the X- and gamma-ray emissions from the high energy particles in solar flare: for example at looptop and foot points of impulsive flare. In this paper we suggest that the multiple fast shock are created in the reconnection jet and they create the high energy particles by performing two-dimensional numerical resistive magnetohydrodynamic simulations. As the results we find that the current sheet becomes thin by tearing instability and it collapses to Sweet-Parker current sheet. The thin current sheet becomes unstable to the tearing instability again. The fast reconnection starts immediately after the plasmoid-ejection which are created by the secondary tearing instability. The internal shocks are created inside the reconnection jet due to the nonsteady plasmoid-ejection created by the secondary tearing instability. In the next phase the reconnection jet starts to oscillate which is due to Kelvin-Helmholtz instability or turbulence reconnection. The reconnection jet collides with two standing slow shocks so that the fast shocks are created as the oblique shocks. The fast shocks created by the magnetic reconnection is possible sites for the particle acceleration.
Shibata Kazunari
Tanuma Seiichi
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