Physics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..555h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 7, p. 555-558.
Physics
4
Earth Magnetosphere, Magnetic Field Configurations, Magnetotails, Plasma Equilibrium, Plasma Pressure, Adiabatic Conditions, Anisotropy, Convection, Equilibrium Equations, Magnetic Storms, Two Dimensional Models
Scientific paper
This paper reports on self-consistent 2D equilibria with anisotropic plasma pressure for the earth's magnetotail. These configurations are obtained by numerically solving the generalized Grad-Shafranov equation, describing anisotropic plasmas with P-parallel is not equal to p-perpendicular, including the earth's dipolar field. Consistency between these new equilibria and the assumption of steady-state, sunward convection, described by the double-adiabatic laws, is examined. As for the case of isotropic pressure (Erickson and Wolf, 1980), there exists a discrepancy between typical quiet-time magnetic field models and the assumption of steady-state double-adiabatic lossless plasma sheet convection. However, unlike that case, this inconsistency cannot be removed by the presence of a weak equatorial normal magnetic field strength in the near tail region: magnetic field configurations of this type produce unreasonably large pressure anisotropies, p-parallel is greater than p-perpendicular, in the plasma sheet.
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