Physics – Plasma Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510105h&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 10, CiteID L10105
Physics
Plasma Physics
6
Space Plasma Physics: Magnetic Reconnection (2723, 7526), Space Plasma Physics: Electrostatic Structures, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetosphere: Outer, Magnetospheric Physics: Magnetosheath
Scientific paper
Generation of electric fields at the scale of the local electron Debye length in collisionless magnetic reconnection is studied through two-dimensional Darwin particle-in-cell simulation. For asymmetric initial temperature and density profile across the Harris current sheet, intense perpendicular electrostatic structure with the local electron Debye-length scaling (~2.9 λ De) is observed near the edge of the magnetic island in the high-temperature/low-density region. It is also found that a weak electron jet with return electron flow on the high-density side results in the formation of an electron current loop. However, in the low density region only a strong electron outflow is detected. Because of a single-looped electric current on each side of the outflow region, the usual quadrupole structure appearing in the earlier symmetric-profile simulations is replaced by a dipole-like structure of the guiding magnetic field. Possible applications of the present results in the dayside magnetopause are discussed.
Huang Jianwei
Li Daming
Ma Zhi-Wei
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