Observations of an intense field-aligned thermal ion flow and associated intense narrow band electric field oscillations

Computer Science – Sound

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Auroral Arcs, Electric Field Strength, Electrostatic Probes, Field Aligned Currents, Ion Temperature, Ionospheric Ion Density, Rocket Sounding, Bandwidth, Cold Plasmas, Flow Velocity, Gyrofrequency, Ion Beams, Javelin Rocket Vehicle, Magnetic Fields

Scientific paper

An investigation is conducted concerning the conditions encountered during a Javelin sounding rocket experiment conducted on Apr. 3, 1970 at Fort Churchill, Canada. Evidence is presented that near the equatorward edge of the auroral arc an intense beam of cold plasma ions was flowing parallel to the earth's magnetic field. The beam was associated with intense narrow band electric field oscillations near the local ion gyrofrequency. The data support the hypothesis that intense electrostatic ion cyclotron waves were driven unstable by field-aligned currents.

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