Some Measurements of Balloon Motions with Doppler Radar

G. E. McVehil Cornell Aeronautical Laboratory, Inc. Buffalo, N.Y.

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R. J. Pilié Cornell Aeronautical Laboratory, Inc. Buffalo, N.Y.

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G. A. Zigrossi Cornell Aeronautical Laboratory, Inc. Buffalo, N.Y.

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Abstract

Ascending one-and two-meter diameter spherical balloons have been tracked with a pulse Doppler radar to determine the characteristics of the radial component of balloon velocity. Spectral analysis of the velocity records reveals oscillations with wavelengths between 12 and 80 meters which are believed to be aerodynamically induced rather than of meteorological origin. The oscillations of the two-meter balloons are of larger amplitude and longer wavelength than those of the one-meter balloons. Evidence is presented indicating that the characteristics of the oscillations are dependent on Reynolds number.

Abstract

Ascending one-and two-meter diameter spherical balloons have been tracked with a pulse Doppler radar to determine the characteristics of the radial component of balloon velocity. Spectral analysis of the velocity records reveals oscillations with wavelengths between 12 and 80 meters which are believed to be aerodynamically induced rather than of meteorological origin. The oscillations of the two-meter balloons are of larger amplitude and longer wavelength than those of the one-meter balloons. Evidence is presented indicating that the characteristics of the oscillations are dependent on Reynolds number.

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