On the frequency of Langmuir waves in the ionosphere

Details On the frequency of Langmuir waves in the ionosphere On the frequency of Langmuir waves in the ionosphere

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714905h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,905-14,910.

Physics

5

Earth Ionosphere, Electron Gas, Electrostatic Waves, Plasma Frequencies, Radar Measurement, Thermal Plasmas, Current Density, Ionospheric Drift, Plasma Density, Velocity Distribution

Scientific paper

Attention is focused on the experimental determination of the frequency of Langmuir waves in the light of environmental and constituent parameters. Accepted considerations required for computing the frequencies are reviewed including temperature dependence in many plasmas. Treatment of the velocity distribution function of the electron gas is critical for revealing the nature of the particles and their effects on frequency. These considerations are examined in the light of experimental data from incoherent-scatter measurements. Frequency asymmetry in upshifted and downshifted plasma lines can be easily affected by bulk motion and temperature of the thermal plasma, and these effects could lead to the large currents predicted from some plasma-line measurements. The frequency of Langmuir waves are of use in the remote determination of plasma concentrations when accurately derived.

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