Incoherent scatter radar observations of irregular structure in mid-latitude sporadic E layers

Physics

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Incoherent Scatter Radar, Midlatitude Atmosphere, Radar Scanning, Sporadic E Layer, Density Distribution, Electron Density Profiles, Gravity Waves, Ionizing Radiation, Ionosondes, Kelvin-Helmholtz Instability, Metal Ions, Phase Modulation, Radio Waves, Vertical Distribution, Wavelengths

Scientific paper

The basic experiments used phase-coded pulses to record electron density profiles with a resolution of 600 m in range and 300 m in horizontal extent, while scanning in azimuth. Data from incoherent scatter radar were compared with simultaneous ionosonde observations. Observations of sporadic E layers by incoherent scatter radar were discussed in terms of the effects of the neutral wind system acting on metallic ions. Several features were noted in the data, which support the wind shear mechanism of layer formation. The sporadic E layers often contained a pronounced small-scale structure, especially at times when partially transparent echoes were observed by the ionosonde. Under specific conditions, the ions in a meteor trail can be converged by a shear in the neutral wind into a relatively small irregularity at the center of a sporadic E layer.

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