Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..295w&link_type=abstract
(The earth's middle and upper atmosphere; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission C /M
Physics
Incoherent Scatter Radar, Mesosphere, Radar Echoes, Richardson Number, Very High Frequencies, Wind Shear, Aeronomy, Atmospheric Turbulence, Radar Tracking
Scientific paper
A series of five consecutive foil chaff experiments launched in summer 1987 at Andenes (69 deg N) was investigated in respect to variance of vertical air velocity w, Richardson number Ri and horizontal wind shear. Peaks in variance were seen at certain heights correspond to heights at which the Richardson number is smaller than 0.25 and where the wind shear is larger than about 50/m/s/km. For heights below about 85 km a 1:1 correspondence between MST radar echoes and these turbulent layers were found. This was not the case for heights greater than 86-87 km, and the MST radar echoes were transient in time. Two interpretations of this observation are possible: frozen turbulence drifting in the wind or transient turbulence generated locally.
Widdel Hans-Ulrich
Wu Yong-Fu
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