Aspect angle variations in intensity, phase velocity, and altitude for high-latitude 34-cm E region irregularities

Physics

Scientific paper

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Altitude, Atmospheric Physics, E Region, Magnetic Disturbances, Phase Velocity, Polar Regions, Radar Measurement, Auroral Electrojets, Backscattering, Radar Echoes

Scientific paper

Results are presented on the dependences of backscattered amplitude, phase speed, and altitude of the 34-cm E-region irregularities on the magnetic aspect angle (in the range 0-10 deg), determined with the highly sensitive Millstone Hill 440-MHz radar during antenna-scanning experiments. It was found that, at aspect angles less than 3 deg, the observations were consistent with backscatter from primary Farley-Buneman waves. At these aspect angles, an aspect sensitivity of -15 dB/deg was found during the most intense events, and -10 dB/deg for less intense events. The phase velocity and maximum altitude characteristics of the coherent backscatter observed from aspect angles greater than 3 deg differed markedly from those observed at a smaller aspect angle. At angles between 3 and 6 deg, an aspect sensitivity of -10 dB/deg was found for all events, whereas for aspect angles above 6 deg, the aspect sensitivity decreased to -7 dB/deg.

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