Physics – Plasma Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10417357r&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A8, p. 17357-17368
Physics
Plasma Physics
28
Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Numerical Modeling, Space Plasma Physics: Magnetic Reconnection
Scientific paper
We develop a simple analytic model and use global simulations of Earth's magnetosphere to investigate the effects of electrical resistivity on the topology of the magnetosphere for northward interplanetary magnetic field (IMF). We find that for low resistivity values (<~104Ωm) the magnetosphere remains open after 6 hours of northward IMF. For larger values (>~2×105Ωm) the magnetic flux of the tail lobes decreases rapidly on the timescale of ~1 hour. In this case the tail becomes closed, tadpole-shaped, steady state, and of finite length. The tail length decreases with increasing resistivity and becomes as short as about 50RE for a resistivity value of 106Ωm. Reconnection between IMF and lobe field lines occurs in all cases and is not significantly affected by the resistivity. However, large values of the resistivity annihilate lobe flux and break the frozen-in condition for closed tail flux tubes, leading to a decoupling of the flux tube motion from plasma convection. These effects make the development of a steady, closed tail of finite length possible. Because resistivity values larger than 102Ωm are unrealistic for the quiet time tail, we conclude that the magnetosphere is unlikely to ever close and that models which predict the rapid closure and a steady, finite length tail are possibly in error due to numerical resistivity.
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