Other
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2235m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2235-2238
Other
6
Clutter, Radar Measurement, Radar Scattering, Stratosphere, Vertical Distribution, Wind Velocity, Airborne Radar, Antenna Arrays, Dipole Antennas, Gravity Waves, Radar Antennas, Refractivity, Turbulent Boundary Layer, Very High Frequencies
Scientific paper
The Jicamarca VHF radar (50 MHz) has detected atmospheric echoes in the so-called 'gap region' from 30 to 60 km heights. These echoes are, for the first time, discriminated from clutter echoes, using both co-polarized (co-pol) and cross-polarized (x-pol) arrays to monitor the clutter component which may enter the antenna sidelobes. The atmospheric scatterings in this region are shown to be composed of refractivity layers with thickness as of 1-2 km as in other middle atmospheric height ranges, suggesting that these scatterings are caused by thin turbulent layers. The height profile of inferred vertical wind velocities indicates a wavy structure. The wave amplitude, as a whole, increases with height, suggesting the activity of upward-propagating gravity waves.
Fukao Shoichiro
Kato Susumu
Maekawa Yasuyuki
Tsuda Toshitaka
Woodman Ronald F.
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