Intense Langmuir Waves and Associated Field-Aligned Electrons Observed Between 500-1000 km During a Strong Aurora

Details Intense Langmuir Waves and Associated Field-Aligned Electrons Observed Between 500-1000 km During a Strong Aurora Intense Langmuir Waves and Associated Field-Aligned Electrons Observed Between 500-1000 km During a Strong Aurora

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11c..09p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11C-09

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2483 Wave/Particle Interactions, 2772 Plasma Waves And Instabilities

Scientific paper

Intense, narrowband HF waves at and above the plasma frequency were observed between 500-1000 km on the GEODESIC sounding rocket launched from Poker Flat, Alaska on February 26, 2000. The waves were detected by an electric field instrument that included two orthogonal baselines of 8.8 m and 8.0 m tip-to-tip in the spin plane, a 2.2 m baseline along the spin axis, and additional sensors, 1m inboard of the outer spheres in the spin plane, that provided multiple-baseline amplitude and spaced-receiver measurements. The waves were observed using an on-board digital signal processor and were also captured on numerous occasions in a burst memory which included interferometer channels sampled at 4 Ms/sec. The localized packets of HF waves were associated with downgoing keV field-aligned electron bursts and are believed to be Langmuir waves possibly undergoing mode conversion. The emissions revealed typical amplitudes of ~ 25 mV/m with narrow spectral characteristics that tracked the local plasma frequency as they were observed at different intervals during the flight. The waves were observed during a strong auroral event in which the plasma frequency was higher than the electron gyro frequency. We interpret the observations in view of theoretical descriptions of wave-particle interactions involving beam-driven Langmuir waves.

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