Investigations of the Dynamics and Thermodynamics of the Mesosphere and Upper Thermosphere at the Polar Regions PDF Download
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Author: G. Hernandez
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
The instrumentation at the Poker Flat (Alaska) field site has been made operational in teleautonomous mode. This application of telescience principles has allowed long-wire operation of the multiple-beam spectrometer at the field site, and makes it possible to efficiently obtain further observations of the dynamics and thermodynamics of the upper thermosphere. These observations have been used to show the lowest latitude at which the y-component of the IMF(Interplanetary Magnetic Field) distorts the classical two-cell convection cell in the upper thermosphere. The first simultaneous measurements of the dynamics and thermodynamics of the polar mesosphere show large fluctuations in the wind field and seem to be associated with temperature fluctuations. At this time, we were able to monitor a mesospheric event, characterized by a large decrease of the emission rate of the emissions from this region. A double-etalon modulator (DEM) has been theoretically developed and its properties have been experimentally confirmed. The DEM is a compensated device with nearly 100 times the luminosity of presently available spectrometers. Keywords: Telemeter systems, Atmospheric physics, Atmospheric motion, Optical preprocessing, Near infrared radiation, Hydroxyl radicals. (edc).
Author: G. Hernandez
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Book Description
The instrumentation at the Poker Flat (Alaska) field site has been made operational in teleautonomous mode. This application of telescience principles has allowed long-wire operation of the multiple-beam spectrometer at the field site, and makes it possible to efficiently obtain further observations of the dynamics and thermodynamics of the upper thermosphere. These observations have been used to show the lowest latitude at which the y-component of the IMF(Interplanetary Magnetic Field) distorts the classical two-cell convection cell in the upper thermosphere. The first simultaneous measurements of the dynamics and thermodynamics of the polar mesosphere show large fluctuations in the wind field and seem to be associated with temperature fluctuations. At this time, we were able to monitor a mesospheric event, characterized by a large decrease of the emission rate of the emissions from this region. A double-etalon modulator (DEM) has been theoretically developed and its properties have been experimentally confirmed. The DEM is a compensated device with nearly 100 times the luminosity of presently available spectrometers. Keywords: Telemeter systems, Atmospheric physics, Atmospheric motion, Optical preprocessing, Near infrared radiation, Hydroxyl radicals. (edc).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
This second year of the grant has been a year of consolidation and staging for the continuing research. The advances made at the end of last year, in particular the proof-of-concept of solid state etalons, are now going through the process of testing and validating the findings made with the prototype devices. Thus far, all of the benchmarks of the electrooptic etalon behavior can be repeated, and we have also found-some new characteristics inherent to the device and its operation. For instance, in the non-linearity stage of measurements, it has been found that the reflective coatings are extremely sensitive to the presence of moisture in air. This effect seems to be enhanced by the existence of the electric fields (elrea 20 KV/cm) necessary for the operation of the electrooptic etalon. Operation in a vacuum, or in a controlled atmosphere are the obvious solutions, with the-latter being the preferred choice since it preserves the ideal of a lightweight field device. Recoating of the test etalon was necessary.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 318
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Book Description
Author: R. M. Johnson
Publisher: American Geophysical Union
ISBN: 0875900445
Category : Science
Languages : en
Pages : 354
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Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 87. This volume provides a review of progress made in recent years in experimental and theoretical investigation of the upper mesosphere and lower thermosphere and coupling between these regions and the ionosphere. Detailed study of the mesosphere/lower thermosphere/ionosphere (MLTI) region has historically been difficult because of its relative inaccessibility to direct measurement techniques and the complex and highly coupled processes which occur there. Although we have still not successfully unraveled all these complex interactions, we have made significant recent progress toward a fuller understanding of the basic state of the MLTI and of the dominant wave and coupling processes. This monograph includes a set of tutorial papers, which review our current understanding of aspects of the MLTI. These tutorials are interspersed with a selection of papers describing research progress on various topics of current interest in this region. The book should therefore be useful both to the newcomer, as an introduction to this field of research, and to the more experienced researcher, providing an overview of research in progress as well as a convenient reference collection of papers describing our current understanding.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309046262
Category : Science
Languages : en
Pages : 104
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Book Description
Many nations conduct research and engage in other scientific activities on our frozen continentâ€"Antarctica. Each year the U.S. National Committee for the Scientific Committee on Antarctic Research (SCAR) compiles a book that includes these nations' reports of scientific pursuits undertaken by their citizens in Antarctica during the previous austral summer and of planned activities for the next season. This book details the activities that occurred in 1990 and is of particular value to policymakers and scientists throughout the world who are planning Antarctic programs.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 490
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Book Description
Author: Kaichi Maeda
Publisher:
ISBN:
Category : Atmospheric thermodynamics
Languages : en
Pages : 80
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Book Description
"On the basis of the atmospheric composition given by F.S. Johnson in 1960, the contribution of auroral particles to the dissociation of oxygen molecules in the polar upper atmosphere is investigated. ... The heating of the polar mesosphere by exothermic association of the oxygen atoms, intensified by the subsidence of the upper polar atmosphere during the polar night, is calculated and found to be close to the estimate given by W.W. Kellogg in 1961. The investigation indicates, however, that Kellogg's estimate should be reduced slightly to allow for the cooling effect produced by far infrared emission from atomic oxygen in the upper atmosphere."--Page i.
Author: Alexander Kokhanovsky
Publisher: Springer Nature
ISBN: 3030335666
Category : Science
Languages : en
Pages : 723
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Book Description
This book presents current knowledge on chemistry and physics of Arctic atmosphere. Special attention is given to studies of the Arctic haze phenomenon, Arctic tropospheric clouds, Arctic fog, polar stratospheric and mesospheric clouds, atmospheric dynamics, thermodynamics and radiative transfer as related to the polar environment. The atmosphere-cryosphere feedbacks and atmospheric remote sensing techniques are presented in detail. The problems of climate change in the Arctic are also addressed.
Author: United States. Air Force. Directorate of Chemical and Atmospheric Sciences
Publisher:
ISBN:
Category : Atmospheric chemistry
Languages : en
Pages : 700
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Book Description
Author:
Publisher:
ISBN:
Category : Antarctica
Languages : en
Pages : 466
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Book Description
