The initial behavior of high altitude barium releases. I - The particulate ring. II - The expanding vapor cloud

Details The initial behavior of high altitude barium releases. I - The particulate ring. II - The expanding vapor cloud The initial behavior of high altitude barium releases. I - The particulate ring. II - The expanding vapor cloud

Sep 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jatp...36.1469b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 36, Sept. 1974, p. 1469-1473, 1475-1486.

Computer Science

Sound

Artificial Clouds, Atmospheric Models, Barium Ion Clouds, Gas Expansion, Ionospheric Sounding, Mathematical Models, Particle Size Distribution, Photographic Recording, Plasma Clouds, Radial Distribution, Radiant Flux Density, Rocket Sounding, Scattering Cross Sections, Spectral Emission, Thermosphere

Scientific paper

Large barium vapor releases at high altitude display an expanding particulate ring. Radiometrically calibrated photographic data from four releases has been analyzed, and shows that the particulate cloud scatters light with a wavelength dependence of lambda (2.5 plus or minus 1.1), implying a very high proportion of particles of radius between 0.1 and 1.0 micron. The radial expansion velocity of the particles ranges from 0.1 to 0.7 km/sec, with a most probable value of 0.33 km/sec. The initial expansion of large gaseous releases at altitudes between 150 and 250 km is investigated within the framework of spherical snowplow models. Good agreement is obtained with two simple models during the first 5 to 7 sec after release. It is suggested that a simple dimensionless snowplow model is more valid in the transition regime between linear radial growth and diffusive growth than more sophisticated numerical models.

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