Energetic particles in the vicinity of a possible neutral line in the plasma sheet

Physics

Scientific paper

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Energetic Particles, Geomagnetic Tail, Plasma Diagnostics, Plasma Layers, Space Plasmas, Anisotropy, International Sun Earth Explorers, Magnetohydrodynamic Flow, Neutral Sheets

Scientific paper

Combined plasma, magnetic field, and energetic particle data obtained from ISEE-1 in the geomagnetic tail during two successive energetic particle burst events are presented. The behavior of protons with energies of more than about 100 keV is very different from that of the 30-100 keV protons which represent the suprathermal tail of the plasma sheet distribution. The more energetic ions appear on a time scale of several minutes following a northward turning of the tail magnetic field. At about the same time the plasma measurements show a velocity of about 200 km/s in the tailward direction. From these results, it is argued that two successive magnetic neutral lines are created well within the plasma sheet and move close to the satellite position in the earthward direction. The extent of the neutral line is then limited to the dusk side of the tail.

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