5-50-m wavelength plasma instabilities in the equatorial electrojet. I - Cross-field conditions. II - Two-stream conditions

Details 5-50-m wavelength plasma instabilities in the equatorial electrojet. I - Cross-field conditions. II - Two-stream conditions 5-50-m wavelength plasma instabilities in the equatorial electrojet. I - Cross-field conditions. II - Two-stream conditions

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3561h&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3561-3572. Research supported by the Centre National de la Recherche

Astronomy and Astrophysics

Astronomy

14

Coherent Radar, Crossed Fields, Equatorial Electrojet, Ionospheric Electron Density, Magnetohydrodynamic Stability, Plasma Waves, Spectrum Analysis, Collision Rates, Doppler Effect, Drift Rate, Least Squares Method, Phase Velocity, Plasma Turbulence

Scientific paper

It is noted that electron density irregularities detected with coherent radars in the equatorial electrojet have been studied mainly at wavelengths between 3 and 10 m. In the case of low drift velocities, they have been interpreted by the cross-field instability. Longer wavelengths have been extensively observed using a multifrequency HF radar system installed in Ethiopia. Data gathered for drift velocities below 200 m/sec are presented. From 5 to 50 m, the measured phase velocity is found to vary with wavelength and elevation angle as predicted by the linear theory. It is found that spectral width increases with wave number but is constant with elevation angle. The ratio of spectral width to mean Doppler shift is on the order of unity, suggesting that strong turbulence has to be included in nonlinear theories. These results are analyzed in light of recent numerical simulations and theoretical works. It is demonstrated that so-called type 1 spectra can be detected at all wavelengths. Their phase velocity is shown to have a value given by the threshold for instability in the full dispersion equation and is constant with elevation angle and time when corrected for neutral wind effect.

Affiliated with

Also associated with

No associations

Rating

5-50-m wavelength plasma instabilities in the equatorial electrojet. I - Cross-field conditions. II - Two-stream conditions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with 5-50-m wavelength plasma instabilities in the equatorial electrojet. I - Cross-field conditions. II - Two-stream conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 5-50-m wavelength plasma instabilities in the equatorial electrojet. I - Cross-field conditions. II - Two-stream conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1442115