Physics – Plasma Physics
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11603217l&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A3, CiteID A03217
Physics
Plasma Physics
Space Plasma Physics: Magnetic Reconnection (2723, 7526), Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Numerical Modeling
Scientific paper
A Hall MHD simulation of multiple X line reconnection, in which a diffusion region around the standing X line and the moving plasmoids are involved, is presented. The observed features of Hall magnetic and electric fields in the diffusion region and the direction reversal of the electron flow in the vicinity of the magnetic separatrices are displayed in case 1 with the guide field By0 = 0. During the passage of a tailward moving plasmoid the bipolar By waveform signatures caused by the Hall current and the Hall electric field signatures in case 1 are qualitatively in line with the observations from the Geotail and Cluster spacecraft. Case 2 with By0 = 0.15 is carried out to investigate the reconnection configuration on the earthward side of the X line. The peaking signature of the positive By correlated with the bipolar (-/+) Bz is observed while an earthward moving plasmoid passes though the given point below the current sheet and close to the midplane; but the negative By is recorded at the given point above the current sheet. Such positive and negative By signatures, which are comparable with the observations from Cluster 3 and other Cluster spacecraft, are attributed to the By asymmetric structures associated with the Hall effect. The enhancement and variation of the electric field detected by Cluster 3 might be related to the -V′ × B electric field associated with the earthward movement of the X line.
Jin Shu-Ping
Liu Chao-Xing
Wei Feng-Si
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