NDLI: Determination of billows and other turbulent structures, part 4.1a

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Determination of billows and other turbulent structures, part 4.1a

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rastogi, P. K.
Copyright Year	1984
Description	Billows are regular, wave-like arrays of cross-flow vortices that develop in stratified oceanic or atmospheric flows with large shear. Atmospheric billows can become manifest through condensation. Billows are frequently seen in their characteristic cloud forms in the lower atmosphere. Under suitable viewing conditions, billows can also be seen in noctilucent clouds that form near the polar mesosphere during the summer months. Other turbulent structures -- related to billows -- are the Kelvin-Helmholtz instability (KHI) and cat's eye structures that occur in fully developed turbulent shear flows. Shear flows may contain perturbations at many different horizontal wavelengths and vertical scales. Realistic theoretical models have been constructed to study the stability and growth of these perturbations. The extent to which billows and Kelvin-Helmholtz instability have been observed in the atmosphere with the use of radars is outlined. Most of these observations are confined to the troposphere. Suggestions are made for improved radar experiments that are required to detect these structures at higher altitudes.
File Size	159185
Page Count	3
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850024187
Archival Resource Key	ark:/13960/t02z62n53
Language	English
Publisher Date	1984-12-01
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Atmospheric Circulation Meteorological Radar High Resolution Turbulent Flow Vortices Shear Flow Kelvin-helmholtz Instability Perturbation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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