Computer Science – Sound
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3777e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3777-3787.
Computer Science
Sound
21
Auroral Zones, Electrostatic Waves, Field Aligned Currents, Ionospheric Electron Density, Whistlers, Polar Substorms, Rocket Sounding
Scientific paper
Large-amplitude electrostatic whistler waves near the lower hybrid frequency were observed by an auroral sounding rocket during substorm breakup. The measured wavelengths indicate that the emissions were electrostatic and resonant with electrons that had parallel energies of a few hundred electron volts. We propose that the intense emissions drew their energy from dispersive bursts of low-energy, field-aligned electron fluxes. The dispersive bursts are known to cause a brief, but intense instability that results in large-amplitude Langmuir emissions. The high-frequency emissions can rapidly form a plateau in the one-dimensional electron distribution. We show, however, that these distributions remain unstable to electrostatic whistler waves near the lower hybrid frequency. The amplitude and wavelength of the observed emissions were sufficient to accelerate the hydrogen ions with energies between about 50 eV and about 200 eV.
Carlson Carl W.
Delory Gregory T.
Ergun Robert E.
Klementis E.
McFadden James P.
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