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- Author or Editor: Louis J. Battan x
- Journal of Atmospheric and Oceanic Technology x
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Abstract
A technique is discussed for measuring the wobbling or tumbling characteristics of simulated oblate hailstones. It involves the use of a suitable radar for tracking ice or Stycast, oblate spheroids dropped from an airplane or balloon and for making nearly continuous measurements of radar cross sections (and differential reflectivities, if possible) as functions of time and altitude. Analyses of such measurements should yield information on the rotational behavior of the falling spheroids.
Abstract
A technique is discussed for measuring the wobbling or tumbling characteristics of simulated oblate hailstones. It involves the use of a suitable radar for tracking ice or Stycast, oblate spheroids dropped from an airplane or balloon and for making nearly continuous measurements of radar cross sections (and differential reflectivities, if possible) as functions of time and altitude. Analyses of such measurements should yield information on the rotational behavior of the falling spheroids.
Abstract
Calculations have been made of the radar backscattering, differential reflectivity, and circular depolarization ratio of large oblate spheroids composed of spongy ice. Results are compatible with laboratory measurements by earlier investigators. As expected, scattering of 10-cm radiation depends to an important extent on the size, water content, and axial ratios of the spheroids. Observations of differential reflectivities close to zero in hailstorms can be explained, as was done by V. N. Bringi and his associates, as resulting from the irregular shapes and tumbling of hailstones. But such observations could also be explained by size-distributed oblate spheroids with equivalent diameters greater than about 3.5 cm, falling with vertical symmetry axes.
Abstract
Calculations have been made of the radar backscattering, differential reflectivity, and circular depolarization ratio of large oblate spheroids composed of spongy ice. Results are compatible with laboratory measurements by earlier investigators. As expected, scattering of 10-cm radiation depends to an important extent on the size, water content, and axial ratios of the spheroids. Observations of differential reflectivities close to zero in hailstorms can be explained, as was done by V. N. Bringi and his associates, as resulting from the irregular shapes and tumbling of hailstones. But such observations could also be explained by size-distributed oblate spheroids with equivalent diameters greater than about 3.5 cm, falling with vertical symmetry axes.
