The mass dependence of wave particle interactions as observed with the ISEE-1 energetic ion mass spectrometer

Physics

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Energetic Particles, Mass Spectroscopy, Particle Interactions, Satellite Observation, Wave Interaction, Hydrogen Ions, International Sun Earth Explorer 1, Oxygen Ions, Particle Acceleration, Pitch (Inclination), Positive Ions

Scientific paper

Simultaneous measurements of the O(+) and H(+) distributions from two transverse acceleration events in the high altitude auroral ionosphere are presented. The data were acquired from the energetic ion mass spectrometer on the ISEE-1 satellite, in the dusk sector, on auroral field lines (L = 8-9), at geocentric radial distances of about 3 earth radii. Temporal and/or spatial fluctuations during the measurement cycle resulted in some scatter of the data points, but the transverse velocity distributions are reasonably well represented by maxwellians at energies in the few hundred eV range. The transverse temperatures were about 60 eV in both cases and no significant differences were observed between the temperatures of the O(+) and H(+). The flux intensities of the two ion species were also generally comparable.

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