Precipitating and trapped ions and electrons observed at 840 km during the great magnetic storm of February 1986

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Magnetic Storms, Magnetically Trapped Particles, Magnetospheric Electron Density, Magnetospheric Ion Density, Particle Precipitation, Plasmasphere, Auroras, Dmsp Satellites, Kp Index, Radiation Belts, Sunspots

Scientific paper

A detailed picture is presented of the equatorward boundaries of the auroral ovals at dawn, morning, dusk, and evening for the three most disturbed days of February 1986. North-south symmetry for the boundaries of keV particles was good, and the differences between the ion and electron boundaries agreed with statistics, which show the ion edge slightly equatorward of the electron edge at dusk, with the reverse for dawn. The electron boundary was most equatorward of the ion boundary for morning. Best symmetry and least difference were for evening, the sector nearest the central plasma sheet. Ions with energies from thermal to several hundred electron volts penetrated inward to L = 1.2. Very energetic, MeV, particles occurred near 52 deg MLAT, mainly after storm maximum and often unsymmetrically, which may reflect a characteristic akin to the South Atlantic Anomaly.

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