Review of the equatorial electrojet instability in light of recent developments in HF radar measurements

Details Review of the equatorial electrojet instability in light of recent developments in HF radar measurements Review of the equatorial electrojet instability in light of recent developments in HF radar measurements

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..579c&link_type=abstract

(International Symposium on Equatorial Aeronomy - I, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrestri

Physics

6

E Region, Equatorial Electrojet, Ionospheric Disturbances, Magnetohydrodynamic Stability, Radar Measurement, Atmospheric Turbulence, Doppler Radar, High Frequencies, Ionospheric Drift, Laminar Flow, Type 2 Bursts

Scientific paper

Recent HF radar observations of equatorial electrojet irregularities are reviewed and are related to VHF radar observations and to electrojet instability theories. During usual electrojet conditions, similar Type 2 spectra are observed at both long and short wavelengths and the long wavelength Type 1 has a constant phase velocity equal to the threshold given by the linear theory. During strong counter-electrojet conditions, no Type 2 spectra occur and the observed spectra referred to here as Type 0 have characteristics in agreement with the linear theory, i.e. a phase velocity proportional to the electron velocity and to the cosine of the elevation angle. Taking advantage of the refraction of the HF radio waves in the E-layer, strong horizontal plasma instabilities are detected. The dominant phenomenon seems to be the presence or the absence of large scale turbulence: Type 0 spectra are related to unstable waves in the absence of large scale turbulence, Type 1 spectra to unstable waves in the presence of large scale turbulence and Type 2 spectra to linearly stable waves in the presence of large scale turbulence.

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