Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51.1003m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Nov.-Dec. 1989, p. 1003-1016. Research supported by NS
Physics
4
D Region, High Frequencies, Radar Echoes, Radar Scattering, Wind Profiles, Annual Variations, Diurnal Variations, Gravity Waves, Ionospheric Electron Density, Wind Shear
Scientific paper
The Saskatoon MF radar (2.2 MHz) at 52 deg N, 107 deg W, has been used to measure the heights of occurrence of radar scatter during four seasons, and twelve months of 1986/87. Mean winds, and gravity waves are also available, by the spaced antenna method and from the same radar echoes. Certain heights, called elsewhere 'preferred heights', are identified near 60 km, 70 km, 75 km in summer, and 80-86 km. Several layers have seasonal and diurnal variations. Associations with electron density gradients (rocket data), mean wind shear in summer, and gravity wave amplitude-minima in the equinoxes are effectively demonstrated. Case studies, involving 3 h data sets of radar scatter and wind elaborate the comparison: gravity waves of long period (greater than 6 h) are shown to modulate the scattering process.
Manson Alan H.
Meek Chris E.
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