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Composition measurements in an accelerated flow event at the Earth's dayside magnetopause show evidence for reflection and transmission of magnetospheric and magnetosheath ion species. Furthermore, a single velocity transformation approximately tangent to the magnetopause surface orders the individual transmitted and reflected ion distributions on both sides of the magnetopause into field‐aligned flow at V A , the local Alfven speed. These observations provide strong evidence for a kinetic description of magnetic reconnection at the magnetopause.
Fuselier et al. (Fri,) studied this question.