Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1425r&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1425
Mathematics
Logic
2723 Magnetic Reconnection (7526, 7835), 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526)
Scientific paper
Magnetic reconnection is the topological change of magnetic field lines during which magnetic energy is converted to plasma energy. One of the important goals in magnetic reconnection research is to explain the fast reconnection rate observed in laboratory, space and astrophysical plasmas. Recent breakthroughs show that non-MHD effects, including the Hall effect and electromagnetic fluctuations, can facilitate fast magnetic reconnection. The Hall effect has been found to drive fast magnetic reconnection in 2D numerical simulations [1]. A signature of the Hall effect is an out-of-plane quadrupole field in the reconnection region, which has been clearly observed in the Magnetic Reconnection Experiment (MRX) [2,3]. The spatial scale of the quadrupole field and the electron flow pattern agree well with numerical simulations. Measurements also show that the Hall effect is more significant in the collisionless regime than in the collisional regime, indicating that the Hall effect plays an important role in collisionless fast reconnection. Magnetic fluctuations in the lower-hybrid frequency range have been observed along with the quadrupole field; these fluctuations happen not only in the current sheet center region [4], but also in the outflow region. Comparisons with space observations and numerical simulations will be discussed. This work is supported by DOE, NSF and NASA. [1] J. Birn et al., J. Geophys. Res., 106, 3715, 2001 [2] Y. Ren et al., Phys. Rev. Lett., 95, 055003, 2005 [3] M. Yamada et al., Phys. Plasmas, 13, 052119, 2006 [4] H. Ji et al., Phys. Rev. Lett., 92, 115001, 2004
Gerhardt S. P.
Ji Hantao
Kulsrud Russell
Kuritsyn Aleksey
Ren Yan-Yu
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