Abstract
We study the characteristics of the ion population encountered in the high latitude magnetosphere in the vicinity of the terminator for two passes of the INTERBALL-1 satellite. Analysis of data from the Low Energy Plasma Composition Experiment (AMEI-2) reveals the coexisting of ions with different origin: 1) from composition point of view - Solar wind and ionospheric plasmas; 2) from spectral poi of view - plasma sheet-like ions with energy-per-charge above 4 keV/q, together with magnetosheath-like plasma in the mantle part of the region and accelerated up to ∼ 2 keV/q and heated isotropic Solar wind plasma. A remarkable phenomenon is the accelerated to equal energy-per-charge (2.35 – 4.64 keV/q) both SW and ionospheric ions observed on mantle field lines.
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