Computer Science – Sound
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615931w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,931-15,942.
Computer Science
Sound
2
Artificial Clouds, Chaff, Middle Atmosphere, Solitary Waves, Wind Profiles, Atmospheric Turbulence, Balloon Sounding, Radar Cross Sections, Rocket Sounding
Scientific paper
Results are reported from a foil-chaff experimental study of solitary waves using an in situ motion sensor which responds instantly to changes in air velocity. The signal-to-noise ratio of a radar echo from a chaff cloud which was released at a height of 105 km is illustrated. The initial velocity of the foils relative to the ambient air given by the spin of a rocket is decreased by the aerodynamic drag forces, which are proportional to the velocity and air density. After a certain time the foils come practically to rest, they cease to spread, and the radar return cross section then stabilizes on a fairly constant value which it keeps unless atmospheric motions change it through further spreading of the foils. A selection of effects which are difficult to observe and to follow in detail by other experimental methods is presented, and data are adduced which suggest that a solitary wave was observed.
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