Physics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2943l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2943-2945
Physics
2
Geomagnetic Tail, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetohydrodynamic Flow, Neutral Sheets, Planetary Magnetic Fields, Satellite Observation, Solar Wind, Space Plasmas, Field Emission, Geophysical Satellites, International Sun Earth Explorer 3, Magnetic Flux, Mathematical Models, Solar Planetary Interactions
Scientific paper
International Sun Earth Explorer-3 (ISEE-3) and GEOTAIL observations have revealed that at x = -210 to -220 R(sub E), the z-component of mangetic field across the tail neutral sheet is positive, and the plasma flow is tailward during geomagnetically quiet times. Observations have also shown that the y- and z-components of the interplanetary magnetic field (IMF) partially penetrate into the magnetotail for both positive and negative IMF B(sub z). We have evaluated the topology of the magnetospheric magnetic field expected from a partial penetration of the IMF when it has a positive z-component. We find that, in addition to the closed and purely IMF field lines that are generally acknowledged to exist for a southward IMF B(sub z), there is a region at intermediate radial distances of open field lines that cross the tail neutral sheet before exiting the magnetosphere. This region lies between x approximately equals -325 R(sub E) and x approximately equals -325 R(sub E) for the representative IMF orientation and model that we have used. We suggest that the quiet-time observations from ISEE-3 and GEOTAIL of tailward flow and positive B(sub z) across the distant tail neutral sheet were obtained during positive IMF B(sub z) conditions and in the region of open field lines. Such an explanation would also account for the GEOTAIL observation that magnetosheath-like plasma associated with positive B(sub z) is common in the distant tail plasma sheet beyond 150 R(sub E) but not closer to the Earth.
Lyons Larry R.
Pridmore-Brown D. C.
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