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Relating field-aligned beams to inverted-V structures and visible auroras

Dandouras, I.; Rème, H.; Parks, G. K. +5 more

The ion composition experiment on Cluster measures 3-D distributions in one spin of the spacecraft (4 s). These distributions often measure field-aligned ion beams (H⁺, He⁺ and O⁺) accelerated out of the ionosphere. The standard model of these beams relies on a quasi-static U-shaped potential model. The beams conta…