Abstract Using simultaneous observations from the High altitude Plasma Instrument and the Plasma Wave Instrument on board the Dynamics Explorer-1 satellite, we have examined 28 auroral zone crossings equally divided among dayside and nightside cases covering a range of Kp values from 1- to 8. We find that in the diffuse auroral region (CPS) electrostatic emissions of frequencies up to a few kHz are associated with low-energy, field aligned electron beams. Of 18 cases (11 nightside; 7 dayside) examined at high resolution in the particle data, 15 (9 nightside; 7 dayside) exhibited the field aligned beams with the electrostatic waves. In most cases the beams were upward-directed, but occasionally they traveled both up and down the field line. The three cases showing no beams occurred during intervals of Kp < 2. We interpret the electrostatic emissions as electron acoustic mode waves excited by the field aligned beams. A stability analysis based on the plasma parameters of one of the passes supports this interpretation.
Plasma waves associated with diffuse auroral electrons at mid-altitudes
Advances in Space Research ; 8 , 9-10 ; 447-452
1989-01-01
6 pages
Article (Journal)
Electronic Resource
English
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