Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ge%26ae..22..263k&link_type=abstract
Geomagnetizm i Aeronomiia, vol. 22, Mar.-Apr. 1982, p. 263-266. In Russian.
Physics
Auroras, Magnetohydrodynamic Stability, Plasma Density, Plasma Layers, Space Plasmas, Beta Particles, Current Density, Ion Density (Concentration), Larmor Radius, Magnetic Field Configurations, Plasma Drift
Scientific paper
It is shown that the flute instability can be excited in the auroral plasma owing to the fact that the beta parameter is greater than unity in the region of the plasma sheet and the partial ring current. The development of this instability is examined with allowance for the finite Larmor radius of ions and saturation due to nonlinearity. The difference between hot-ion drift and electron drift can provide the longitudinal current density necessary for the occurrence of auroral effects associated with discrete arcs in the case when there is a transverse irregularity of ions; this difference can also be responsible for the formation of these irregularities themselves in the near part of the plasma sheet when beta is greater than unity and the magnetic field is a quasi-dipole one.
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