ISEE 1 charged particle observations indicative of open magnetospheric field lines near the subsolar region

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Charged Particles, Earth Magnetosphere, International Sun Earth Explorer 1, Lines Of Force, Particle Density (Concentration), Magnetic Equator, Magnetohydrodynamic Flow, Magnetospheric Electron Density, Magnetospheric Ion Density, Topology

Scientific paper

On November 20, 1977, at 0230-0300 UT, ISEE 1 encountered unusual charged particle distributions within the magnetosphere. The three-dimensional distribution observations for energetic (greater than 24 keV) ions and plasma show the development of field-aligned asymmetries in the energetic ion distributions simultaneously with a marked change in plasma flow. It is concluded that the most likely explanation for these observations is that ISEE 1 encountered open magnetospheric field lines at its position within the magnetosphere (1030 LT and 1200 plus or minus 300 km from the magnetopause). Field lines were open near the geomagnetic equator, and the geometry was spatially or temporally variable. Other features of the field line topology are presented.

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