Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm33c..02j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM33C-02
Physics
7831 Laboratory Studies And Experimental Techniques, 7835 Magnetic Reconnection (2723, 7526), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
The magnetic reconnection process is generally thought to be determined by both the local plasma dynamics and the global boundary conditions. These effects are systematically studied in detail in Magnetic Reconnection Experiment (MRX). Local to the diffusion region, signatures of decoupled laminar ion and electron motions (the so-called Hall effect) [1] and high-frequency electromagnetic waves [2] have been detected. When the plasma collisionality is varied, the strength of these effects correlates positively with the effective resistivity, which is also found to be inversely proportional to the current sheet length [3]. As a result, the reconnection is accelerated by both the resistivity enhancement and the current sheet shortening. The effects of global boundaries are studied by varying the distance between two driving flux-cores. It is found that the current sheet length increases with the flux-core distance at a given collisionality, slowing down the reconnection rate [3]. Thus, the reconnection rate is a function of both the local plasma collisionality and the global boundary conditions, consistent with a generalized Sweet-Parker model [4]. Comparisons with magnetospheric measurements, including possible contributions to the coming MMS mission as well as implications to solar flares will be also discussed. This work is supported by DoE and NASA. [1] Ren et al. PRL (2005); Yamada et al. PoP (2006). [2] Ji et al. PRL (2004); Ji et al. JGR (2005). [3] Kuritsyn et al. to be submitted (2006). [4] Ji et al. PRL (1998).
Dorfman S.
Gerhardt Stefan
Ji Hantao
Kulsrud Russell
Kuritsyn Aleksey
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