Physics
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..931a&link_type=abstract
(IAGA, Symposium on Coupling, Energetics, Dynamics and Electrodynamics of Atmospheric Regions, Vancouver, Canada, Aug. 1987) Jou
Physics
7
D Region, Doppler Radar, E Region, Radar Tracking, Traveling Ionospheric Disturbances, Antenna Arrays, Image Processing, Interferometry, Lunar Eclipses
Scientific paper
Two methods were used to observe TIDs in the nighttime D- and E-regions with a 2.66 MHz imaging Doppler interferometer radar. The first set of observations were made during a period of OH IR mesopause structure activity made visible by the presence of a total lunar eclipse. The TID was observed as a spaced series of traveling entities, suggesting that the gravity wave itself was the source of the scattering. A velocity of 135 m/s to the south was measured, giving a horizontal wavelength of 440 km. In the second set, moving ripples on the underside of the sporadic-E layer were observed on two nights of significant OH IR and OI 5577 A activity. TID velocities between 120 and 300 m/s with predominately southwest directions were observed. The results suggest that the measurement of mesospheric bulk winds with medium frequency radars should be approached with caution. It is shown that, compared to OH structures, the TIDs travel faster, have longer apparent horizontal wavelengths, and generally travel in the opposite direction.
Adams Gene W.
Brosnahan John W.
Halderman T. D.
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