Traveling Ionospheric Disturbances at northern mid-latitudes

Details Traveling Ionospheric Disturbances at northern mid-latitudes Traveling Ionospheric Disturbances at northern mid-latitudes

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33b1642m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA33B-1642

Physics

2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere

Scientific paper

Three low power coded transmitters have been used for measurement of gravity waves at London, Canada (43 geog. lat., 54 mag. lat). The transmitters are at apexes of an approximately equilateral triangle with 72 km sides. The signals reflected from the ionosphere are received at our university campus which is located within the triangle. TID measurements on 4 MHz have been recorded for more than 1 year. In all months daytime TIDs have closely the same behaviour. Motion is towards the east around dawn, and then slowly rotates clockwise to approximately southward around dusk. The directions are consistent with selective filtering by background tidal winds. The TIDs appear to be just the saturated spectrum of mesospheric gravity waves propagated to F-region heights. Since 2008 was very quiet magnetically we did not observe any obvious TIDs that might be from auroral zone disturbances.

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