The bottomside mid-latitude ionospheric trough

Details The bottomside mid-latitude ionospheric trough The bottomside mid-latitude ionospheric trough

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..605l&link_type=abstract

(Australian and New Zealand Association for the Advancement of Science, Conference, Auckland University, Auckland, New Zealand,

Physics

1

Atmospheric Models, F 2 Region, Ionospheric Ion Density, Ionospheric Propagation, Midlatitude Atmosphere, Alouette 1 Satellite, Alouette 2 Satellite, Diurnal Variations, Doppler Effect, Radio Waves, Troughs

Scientific paper

The measured power losses and Doppler shifts of HF radio waves propagated over a long, west-east, subauroral path are found to exhibit features which cannot be explained by simple predictions and models. Both theory and the limited available data indicate that a bottomside F2-layer depletion should be present below the topside mid-latitude trough. Introducing this into the models (using the mean statistical positions of the trough deduced from Alouette I and II soundings) is shown to explain many of these features. From the Doppler shifts and a simple ray-tracing model the height of the depleted F2-peak inside the trough is deduced to be greater than its value outside the trough by an amount of the order of only 30-80 km.

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