Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.8707h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A6, June 1, 1992, p. 8707-8711.
Astronomy and Astrophysics
Astrophysics
11
Geomagnetic Tail, Magnetic Field Configurations, Magnetohydrodynamic Stability, Current Sheets, Flux Density, Magnetic Storms, Neutral Sheets
Scientific paper
A 2D MHD equilibrium theory is used to show that an enhancement of the magnetic By component in the earth's magnetotail might lead to the disruption of the near-earth cross-tail currents and thus to the onset of a magnetospheric substorm. Using numerical solutions to the linear Grad-Shafranov equation, the effect of a cross-tail magnetic field component By on MHD equilibria is illustrated. Computing sequences of quasi-static equilibria by increasing either By or the thermal plasma pressure, it is shown that the magnetosphere can change from a 'dipolar' tail structure to a tail configuration with highly sheared and/or stretched field lines. Increasing By beyond critical values may lead to catastrophic configurations in the near-earth plasma sheet, beyond which no acceptable equilibrium solution exists.
Hau Lin-Ni
Voigt Gerd-Hannes
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