Physics – Plasma Physics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.1939y&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A2, p. 1939-1948
Physics
Plasma Physics
11
Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Waves And Instabilities
Scientific paper
This article presents a two-fluid stability analysis of Harris current sheet equilibrium under the assumption of charge quasi-neutrality. It is found that the charge neutrality condition leads to sausage-type fluctuations, which propagate along the direction of the cross-field current flow, hence the drift-sausage mode. It is also shown that solutions which correspond to kink-type perturbations do not exist under the present assumption of charge neutrality. In view of the fact that a substantial body of simulation works exist which report predominantly kink-like perturbations, and that analytical theories which do not assume charge quasi-neutrality predict that the kink-type mode is a dominant unstable mode, it is concluded that the assumption of quasi-neutrality may be a poor choice in describing the stability of Harris current sheet equilibrium.
Lui Anthony Tat Yin
Yoon Peter H.
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