Neutral Composition Measurements Of The Mesosphere And Lower Thermosphere

Author : Charles R. Philbrick
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.57/5 ( download)

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Download or read book Neutral Composition Measurements of the Mesosphere and Lower Thermosphere written by Charles R. Philbrick and published by . This book was released on 1971 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recently developed rocket-borne mass spectrometer which employs a LN2 cryosorption pump has successfully obtained the first direct measurements of the major and minor neutral constituents of the mesosphere and lower thermosphere. The mass analysis is performed using an rf quadrupole spectrometer with an electron impact ion source. Measurements were obtained from two flights, and the preliminary results from one of these are presented. The constituents measured include N2, O2, Ar, O, CO2, O3, and several other minor constituents. Measurements were obtained from 70 to 120 km. Atomic oxygen measurements were obtained between 85 km and apogee on both up-leg and down-leg of the flight. The atomic oxygen measurements were obtained at lower altitudes by switching the ion source potentials on alternate spectral scans to ionize with 20-eV electrons. The lower ionizing energy reduces that portion of the signal at 16 amu due to dissociative ionization of O2. Number density profiles of individual constituents were obtained by normalizing the relative abundances to a density model. (Author).

Author : Charles R. Philbrick
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.51/5 ( download)

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Download or read book Neutral Composition Measurements of the Mesosphere and Lower Thermosphere written by Charles R. Philbrick and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A recently developed rocket-borne mass spectrometer which employs a LN2 cryosorption pump has successfully obtained the first direct measurements of the major and minor neutral constituents of the mesosphere and lower thermosphere. The mass analysis is performed using an rf quadrupole spectrometer with an electron impact ion source. Measurements were obtained from two flights, and the preliminary results from one of these are presented. The constituents measured include N2, O2, Ar, O, CO2, O3, and several other minor constituents. Measurements were obtained from 70 to 120 km. Atomic oxygen measurements were obtained between 85 km and apogee on both up-leg and down-leg of the flight. The atomic oxygen measurements were obtained at lower altitudes by switching the ion source potentials on alternate spectral scans to ionize with 20-eV electrons. The lower ionizing energy reduces that portion of the signal at 16 amu due to dissociative ionization of O2. Number density profiles of individual constituents were obtained by normalizing the relative abundances to a density model. (Author)

Author : R. M. Johnson
Publisher : American Geophysical Union
ISBN 13 : 0875900445
Total Pages : 354 pages
Book Rating : 4.45/5 ( download)

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Download or read book The Upper Mesosphere and Lower Thermosphere written by R. M. Johnson and published by American Geophysical Union. This book was released on 1995-01-09 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : L. Thomas
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.48/5 ( download)

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Download or read book The Composition of the Mesosphere and Lower Thermosphere written by L. Thomas and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Lyle Harold Johnson
Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.74/5 ( download)

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Download or read book Composition and Winds in the Earth's Lower Thermosphere written by Lyle Harold Johnson and published by . This book was released on 1982 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author :
Publisher :
ISBN 13 :
Total Pages : 1056 pages
Book Rating : 4.92/5 ( download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Boris Strelnikov
Publisher :
ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.50/5 ( download)

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Download or read book In Situ Measurements of Small Scale Neutral and Plasma Dynamics in the Mesosphere, Lower Thermosphere Region written by Boris Strelnikov and published by . This book was released on 2006 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : K. S. W. Champion
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.57/5 ( download)

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Download or read book Dynamics and Structure of the Quiet Thermosphere written by K. S. W. Champion and published by . This book was released on 1974 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The COSPAR International Reference Atmospheres (CIRA) 1972 provides both a Mean International Reference Atmosphere of the thermosphere and a parametric set of models for the region. The models are based on knowledge of the thermosphere as of mid 1971. The differences in the diurnal variations of atmospheric density scale height obtained from satellite drag studies and temperatures obtained from incoherent radar scatter observations are probably due to different diurnal variations of density and temperature and not due to systematic discrepancies in the measurements. The answer to this question should be provided by data obtained from recently launched satellites ESRO IV, AEROS, and AE-C. The second major area of interest involves the absolute number densities and variations with time of day, latitude, and season of the major and minor constituents of the thermosphere. Recent data obtained with mass spectrometers and optical instruments are reviewed in addition to the results of theoretical composition calculations, which include turbulence and other transport effects.

Author : Robert M. Haberle
Publisher : Cambridge University Press
ISBN 13 : 110817938X
Total Pages : 613 pages
Book Rating : 4.86/5 ( download)

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Download or read book The Atmosphere and Climate of Mars written by Robert M. Haberle and published by Cambridge University Press. This book was released on 2017-06-29 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humanity has long been fascinated by the planet Mars. Was its climate ever conducive to life? What is the atmosphere like today and why did it change so dramatically over time? Eleven spacecraft have successfully flown to Mars since the Viking mission of the 1970s and early 1980s. These orbiters, landers and rovers have generated vast amounts of data that now span a Martian decade (roughly eighteen years). This new volume brings together the many new ideas about the atmosphere and climate system that have emerged, including the complex interplay of the volatile and dust cycles, the atmosphere-surface interactions that connect them over time, and the diversity of the planet's environment and its complex history. Including tutorials and explanations of complicated ideas, students, researchers and non-specialists alike are able to use this resource to gain a thorough and up-to-date understanding of this most Earth-like of planetary neighbours.

Author : Eliana Nossa
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.03/5 ( download)

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Download or read book The Dynamics of the Midlatitude Mesosphere and Lower Thermosphere written by Eliana Nossa and published by . This book was released on 2017 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study of the causes of disrupted ionospheric E layers at middle latitudes. The irregularities described here are organized accordingly to the Richardson (Ri) number, starting from negative, to less than one quarter, to larger than one. Since Ri is a function of the neutral winds, a methodology to estimate the mesosphere and lower thermosphere (MLT) neutral winds between 95 - 130 km altitude is applied for data collected during the incoherent scatter radar (ISR) coordinated "World Day" campaigns at Arecibo. The methodology reflects the physical coupling between the neutral atmosphere and the ionosphere at E-layer heights. The method is compared with previous attempts to calculate the neutral winds at the Arecibo Observatory. The methodology is validated using error analysis and considering possible data contamination due to gravity waves. Temperature profiles, electric fields, and ion composition are also estimated. Using those parameters, the subsequent sections of the dissertation study irregularities observed in the neutral atmosphere in the MLT region during the day. Analysis of temperature variations following convective instability events shows that most of the days have broad unstable regions, where the condition needed to develop this kind of instability is present (buoyancy frequency N^20). During these days, disturbed temperature profiles are observed. Dynamic instability studies show zones with 0