Short-term variability in the HF-enhanced plasma line

Details Short-term variability in the HF-enhanced plasma line Short-term variability in the HF-enhanced plasma line

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.1783g&link_type=abstract

Journal of Geophysical Research, vol. 85, Apr. 1, 1980, p. 1783-1786.

Computer Science

Sound

Ionospheric Electron Density, Ionospheric Heating, Plasma Spectra, Plasma-Electromagnetic Interaction, Radio Frequency Heating, Acoustic Ducts, Amplitudes, Line Spectra, Power Spectra

Scientific paper

Plasma lines enhanced by HF radio waves have been used as a tracer of electron density fluctuations in the ionosphere. Both the intensity and the altitude of these plasma lines have been measured with very short time and range resolution. The power spectrum of the range variations indicates a power law dependence with a spectral index of -2.0 over periods of a few minutes to about 8 s; corresponding amplitudes are greater than 500 m to approximately 70 m. Instability and turbulent mechanisms seem to be responsible for the dissipation of large-scale irregularities to form continuously smaller scale sizes. Furthermore, isolated peaks of about 2- to 6-s periods with amplitudes of about 15-90 m have been observed on several occasions. The possible source of these fluctuations could be sound waves ducted in the ionosphere.

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