Source regions of medium scale travelling ionospheric disturbances observed at mid-latitudes

Physics

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Midlatitude Atmosphere, Traveling Ionospheric Disturbances, High Frequencies, Ionospheric Electron Density, Ray Tracing, Thermosphere, Troposphere, Wave Generation, Wind Velocity

Scientific paper

The characteristics of medium scale traveling ionospheric disturbances (MSTIDs) have been determined from observations carried out between 1972 and 1975 at Leicester, U.K. using the HF Doppler technique. By reverse ray tracing through a model atmosphere, an estimate of the source locations of these waves can be obtained. Auroral sources do not appear to represent an important generation mechanism for MSTIDs observed at midlatitudes. The majority of waves originate at tropospheric altitudes at ground ranges of less than 1500 km from the observation point, and a moderate correlation is found between the occurrence frequency of MSTIDs and the intensity of the meteorological jet stream.

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