A method to measure the bulk velocity of an energetic ion distribution in the presence of ion composition mixing

Physics

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Energetic Particles, Geomagnetic Tail, Ion Motion, Plasma Diagnostics, Space Plasmas, International Sun Earth Explorer 3, Plasma Layers, Satellite-Borne Instruments, Solid State Devices, Spectral Energy Distribution, Spherical Harmonics

Scientific paper

A method to determine the bulk velocity of an energetic ion distribution of photons, alpha particles and heavy ions on the basis of solid state detector measurements is presented. The method is applied to data from the Energy Particles Anisotropy Spectrometer on board the ISEE-3 satellite during the deep geomagnetic tail mission of 1982-1983. Measurements of 24 directions and six energy channels from 35 to 619 keV were fitted to the sum of three ion populations and subjected to a velocity transformation. The reduced data were compared to the results of composition plasma experiments and good agreement was found. The estimated error in the bulk ion velocity was 100 km/s. The ion omnidirectional ion flux in the lowest energy channel, and the calculated ion bulk velocity, are both given in graphs.

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