Information on the horizontal and vertical distributions of density and wind and their variation with time is important in the design and operation of aerospace vehicles as well as to atmospheric scientists seeking a more precise description of atmospheric structure. Consequently, we have estimated the variations of density and wind at seven locations for periods of from 1 to 72 h between altitudes 30 and 60 km. In the tropics density variations with time are dominated by a diurnal cycle. At other latitudes the diurnal cycle is too small to detect in a lag variability study based on Meteorological Rocket Network observations because the diurnal components are obscured by random observational errors as well as day-to-day changes in synoptic conditions. In summer there is only a small increase in rms variability of density with time at middle and high latitudes; rms values range from 20 to 4 percent for periods up to 72 h. In winter there is a marked change in the rms variability with time at midlatitudes where rms values increase with time, approaching the climatic variability of 5 or 6 percent in 72 h. At high latitudes rms variations increase more rapidly with time and reach 8 or 9 percent within 72 h. Analyses of midlatitude wind data between 30 and 60 km confirm the presence of a well-defined diurnal wind oscillation. It reaches a maximum amplitude of 10 or 11 m/sec between 50 and 55 km; amplitudes tend to be slightly smaller in tropical and polar regions.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

This handbook is a comprehensive collection of data, formulas, definitions, and theories concerning the natural environment. It was written by scientists of the Air Force Cambridge Research Laboratories (AFCRL) which, in 1976, became the Air Force Geophysics Laboratory (AFGL). It was designed to serve a broad spectrum of users: the planner, designer, developer, and operator of aerospace systems; the scientist who will find the tables and figures a convenient reference in his own field; the specialist who needs environmental data in another discipline; and science minded people who seek a summary of space-age environmental research. Revisions of individual chapters and sections of this handbook will be published as additional environmental research efforts pay off in new knowledge.

Encyclopedia of Atmospheric Sciences, Second Edition, Six Volume Set is an authoritative resource covering all aspects of atmospheric sciences, including both theory and applications. With more than 320 articles and 1,600 figures and photographs, this revised version of the award-winning first edition offers comprehensive coverage of this important field. The six volumes in this set contain broad-ranging articles on topics such as atmospheric chemistry, biogeochemical cycles, boundary layers, clouds, general circulation, global change, mesoscale meteorology, ozone, radar, satellite remote sensing, and weather prediction. The Encyclopedia is an ideal resource for academia, government, and industry in the fields of atmospheric, ocean, and environmental sciences. It is written at a level that allows undergraduate students to understand the material, while providing active researchers with the latest information in the field. Covers all aspects of atmospheric sciences—including both theory and applications Presents more than 320 articles and more than 1,600 figures and photographs Broad-ranging articles include topics such as atmospheric chemistry, biogeochemical cycles, boundary layers, clouds, general circulation, global change, mesoscale meteorology, ozone, radar, satellite remote sensing, and weather prediction An ideal resource for academia, government, and industry in the fields of atmospheric, ocean, and environmental sciences

A comprehensive overview of the structure and variability of the upper atmosphere Earth's upper atmosphere is an open system that is strongly influenced by energy and momentum inputs from both above and below. New observation and modeing techniques have provided insights into dynamics, energetics, and chemical processes in the upper atmosphere. Upper Atmosphere Dynamics and Energetics presents an overview of key research advances in upper atmospheric physics, and measurement and modeling techniques, along with remaining challenges for understanding the state and variability of the upper atmospheric system. Volume highlights include: Insights into the interconnections between different areas of upper atmospheric science Appreciation of the dynamics and complexity of the global upper atmospheric system Techniques for observing and measuring the upper atmosphere Responses of the upper atmosphere to external drivers The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Find out more about the Space Physics and Aeronomy collection in this Q&A with the Editors in Chief