Computer Science – Sound
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..287k&link_type=abstract
Geopysical Research Letters (ISSN 0094-8276), vol. 22, no. 3, p. 287-290
Computer Science
Sound
20
Earth Ionosphere, High Frequencies, Plasma Frequencies, Plasma Waves, Radio Receivers, Waveforms, Whistlers, Atmospheric Sounding, Auroral Zones, Electron Precipitation
Scientific paper
The Freja plasma wave instrument has measured electric field waveforms up to 4 MHz in the auroral ionosphere near 1700 km altitude. The HF snapshot receiver responds to natural signals during every passage through the auroral ionosphere and we have currently identified two kinds of signals: broadband whistler mode emissions with a cut-off at the plasma frequency, narrow band Langmuir wave emissions at the plasma frequency, and mixtures of both wave emissions. The Langmuir wave emissions are frequently narrow band and exhibit a variety of modulational features. These Langmuir waves exist up to amplitudes of roughly 1 volt/m. At larger amplitudes the wave spectra broaden and the waveforms appear to be composed of individual wavepackets, each with 5-10 wave periods. The narrow band Langmuir waves appear to be very common and are observed on nearly every auroral zone pass in which precipitating electrons are observed.
Bonnell John
Holback Bengt
Kintner Paul M.
Powell Steven
Wahlund Jan-Erik
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