Computer Science – Sound
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..605p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, March 20, 1992, p. 605-608. Research supported by NASA.
Computer Science
Sound
14
Atmospheric Ionization, Atmospheric Sounding, Critical Velocity, Ion Production Rates, Rocket Sounding, Electron Density (Concentration), Electron Energy, Electrostatic Waves, Field Aligned Currents, Fokker-Planck Equation, Plasma Clouds, Plasma-Electromagnetic Interaction
Scientific paper
A qualitative analysis is conducted to reconcile the experimental data from critical ionization velocity (CIV) studies with CIV theories. The experimental data are reviewed demonstrating that: (1) the wave frequency is variable and low; (2) the wave polarization is almost isotropic; (3) electron energization is not easily reconciled with the observed wave spectrum; and (4) ambient electron density plays a role in determining CIV triggering conditions. Analytical treatment is given to the dispersion relation of the lower hybrid wave (LWH) instability driven by the streaming of an ion beam generated by the interaction of the neutral cloud with the ambient atmosphere. By incorporating the LWH instabilities of strong turbulence and finite-size effects into theoretical CIV relationships, the observations can be interpreted. The issues raised by the experimental data are understood within the context of a hypothesis of backward propagating nonlinearly collapsing wavepackets.
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