Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1269p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Nov. 1989, p. 1269-1272.
Physics
15
Earth Magnetosphere, Geomagnetic Tail, Magnetic Field Reconnection, Magnetic Storms, Neutral Sheets, Tearing Modes (Plasmas), Collisionless Plasmas, Current Sheets, Electron Orbitals
Scientific paper
Particle simulations are used to investigate the process of collisionless reconnection in a magnetotail configuration which includes a pressure gradient along the tail axis and tail flaring. In the absence of electron stabilization effects, the tearing mode is stabilized when the ion gyrofrequency in the normal field exceeds the growth rate in the corresponding one-dimensional current sheet. The presence of a low-frequency electromagnetic perturbation in the lobes can serve to destabilize a marginally stable current sheet by producing an extended neutral-sheet region which can then undergo reconnection. These results help to explain how X-type neutral lines, such as those associated with the onset of magnetospheric substorms, can be formed in the near-earth plasma sheet.
Coroniti Ferdinan V.
Karimabadi Homa
Pellat Rene
Pritchett Philip L.
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