Download or read book SHARC a Comprehensive Non equilibrium Infrared Radiation Model for the Upper Atmosphere written by and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book SHARC A Model for Calculating Atmospheric and Infrared Radiation Under Non Equilibrium Conditions written by and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new computer model, SHARC, has been developed by the Air Force for calculating high-altitude atmospheric IR radiance and transmittance spectra with a resolution of better than 1/cm. Comprehensive coverage of the 2 to 40 microns (250/cm to 5,000/cm) wavelength region is provided for arbitrary lines of sight in the 50-300 km altitude regime. SHARC accounts for the deviation from local thermodynamic equilibrium (LTE) in vibrational state populations by explicitly modeling the detailed production, loss, and energy transfer process among the important molecular vibrational states. The calculated vibrational populations are found to be similar to those obtained from other non-LTE codes. The radiation transport algorithm is based on a single-line equivalent width approximation along with a statistical correction for line overlap. This approach is reasonably accurate for most applications and is roughly two orders of magnitude faster than the traditional LBL methods which explicitly integrate over individual line shapes. In addition to quiescent atmospheric processes, this model calculates the auroral production and excitation of CO2, NO, and NO(+) in localized regions of the atmosphere. Illustrative comparisons of SHARC predictions to other models and to data from the CIRRIS, SPIRE and FWI field experiments are presented. Non-local thermodynamic equilibrium, Infrared radiation, Computer code, Vibrational and rotational levels, Limb radiance.
Download or read book High altitude Non equilibrium Infrared Emission Models written by Peter P. Wintersteiner and published by . This book was released on 1990 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Description of SHARC the Strategic High altitude Radiance Code written by R. D. Sharma and published by . This book was released on 1989 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Strategic High-Altitude Radiance Code (SHARC) is a new computer code that calculates atmospheric radiation and transmittance for paths from 60 to 300 km altitude in the 2-40 microns spectral region. It models radiation due to NLTE (Non-Local Thermodynamic Equilibrium) molecular emissions. This initial version of SHARC includes the five strongest IR radiators, NO, CO, H 2 O, O3 and CO2. This report describes the code and models used to calculate the NLTE molecular populations and the resulting atmospheric radiance. The SHARC Manual is reproduced in the appendix.
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.
Download or read book Characterization and Propagation of Sources and Backgrounds written by and published by . This book was released on 1994 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Description of SHARC the Strategic High altitude Radiance Code written by R. D. Sharma and published by . This book was released on 1989 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Strategic High-Altitude Radiance Code (SHARC) is a new computer code that calculates atmospheric radiation and transmittance for paths from 60 to 300 km altitude in the 2-40 microns spectral region. It models radiation due to NLTE (Non-Local Thermodynamic Equilibrium) molecular emissions. This initial version of SHARC includes the five strongest IR radiators, NO, CO, H 2 O, O3 and CO2. This report describes the code and models used to calculate the NLTE molecular populations and the resulting atmospheric radiance. The SHARC Manual is reproduced in the appendix.
Download or read book Characterization and Propagation of Sources and Backgrounds written by Wendell R. Watkins and published by . This book was released on 1994 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Equilibrium Radiative Transfer in Structured Atmospheres written by and published by . This book was released on 2002 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nonequilibrium middle and upper atmosphere are very dynamic regions that are structured vertically and horizontally by the presence of persistent temperature inversion layers and by the passage of both atmospheric gravity waves and transient frontal disturbances or bores. The infrared emissions from this part of the atmosphere are already typically not in local thermodynamic equilibrium (LTE) and are further perturbed by the presence of this pervasive atmospheric structure. The inevitable result is highly structured atmospheric emissions that reflect the structure of the atmosphere. Understanding the structure of the atmosphere is essential to understanding the structure of the radiation that it emits. At the same time understanding how atmospheric structure perturbs atmospheric radiation provides a means to sense the perturbing atmospheric processes remotely. We examine methods to calculate the LTE / non-LTE radiative response to temporal and spatial variations of the atmosphere and give examples of applications. We also compare our results with existing field data. Finally, we discuss a proposed new NASA optical / infrared experiment (Waves Explorer) to sense atmospheric gravity waves remotely from earth orbit on a global basis and characterize their sources.
Download or read book Structure in Middle and Upper Atmospheric Infrared Radiance written by and published by . This book was released on 2002 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive database on spatial structure in the infrared radiance of the middle and upper atmosphere has been collected by the Mid- Course Space Experiment (MSX). The observed radiance contains spatial structure down to the scale of hundreds of meters. This spatial structure results from local fluctuations in the temperature and densities of the radiating states of the emitting molecular species as well as fluctuations in radiation transport from the emitting regions to the observer. A portion of this database has been analyzed to obtain statistical parameters characterizing stochastic spatial structure in the observed radiance. Using simple models, the observed statistics have been shown to agree with prior observations and theoretical models of stochastic spatial structure generated by gravity waves for special viewing geometries. The SHARC model has been extended to predict the statistics of stochastic fluctuations in infrared radiance from the statistics characterizing temperature fluctuations in the middle and upper atmosphere for arbitrary viewing geometries. SHARC model predictions have been compared with MSX data and shown to be in generally good agreement. Additional work is in progress to account for the statistics characterizing small spatial scale fluctuations.
Download or read book Description of the Strategic High Altitude Atmospheric Radiation Code SHARC written by and published by . This book was released on 1990 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes an upgraded version of the strategic high- altitude radiance code, SHARC-2. SHARC calculates atmospheric radiance and transmittance over the 2-40 micrometer spectral region for arbitrary paths within 50 and 300 km altitude, including space viewing. It models radiation due to NLTE (Non-Local Thermodynamic Equilibrium molecular emissions which are the dominant sources at these altitudes. This new version, which is now ready for distribution, has been upgraded to include a fully integrated auroral model with time-dependent chemistry, extention down to 50 km altitude, and radiation from the minor isotopes of CO2. In addition, there have been numerous internal upgrades to the various modules. These include a Voigt lineshape for the radiative excitation module; embedding of the auroral region into a quiescent atmosphere; and improvements in the radiation transport algorithms.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High altitude Non equilibrium Infrared Emission Models written by Peter P. Wintersteiner and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Computer Model for Calculating Atmospheric Radiation Under Non equilibrium Conditions written by R. Sharma and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Radiation Phenomena written by Roll K. M. Landshoff and published by Springer. This book was released on 2013-05-30 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is part of a comprehensive review of the thermal radiative properties of air by the Lockheed Palo Alto Research Laboratory for the Defense Atomic Support Agency. The review was published as DASA 1917 (Unclassified) in four parts, April, 1967. Most of this material is now being offered in new editions by Plenum Press. The authors and editors hope that it will be more widely available to scientists and engineers who work in the various fields which require the use of high temperature air properties. F. R. Gilmore and A. Hochstim have revised and increased the material presented in DASA 1917-1 in "Equilibrium Thermodynamic Properties of Air" . The present editors have prepared an introduction for the tables presented in DASA 1917-3 so that "Tables of Radiative Properties of Air" offered herewith is essentially self-contained. A few more figures have been added and a number of errors have been corrected. We have also prepared a slightly revised edition of DASA 1917-4, "Excitation and Non-E"quilibrium Phenomena inAir," offered by Plenum Press at this time as a companion volume. DASA 1917-2, "The Radiative Properties of Heated Air" by B. H. Armstrong and R. W. Nicholls is not being offered in a new edition at this time.
Download or read book Nonequilibrium Radiation Model for Exhaust Plumes written by Gary R. Nickerson and published by . This book was released on 1975 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this work effort has been to develop a computer code to model nonequilibrium infrared core radiation from rocket plumes. Radiation sources caused by atmospheric interaction are not considered in the model. Because of the number of chemical species, vibrational states, and reaction paths involved, a sophisticated kinetic model is required in any attempt to explain experimental observations of infrared radiation when nonequilibrium processes are important. Such a model is also needed to predict conditions where more conventional thermodynamically based models might be properly applied. In the present study the radiating medium is assumed to be optically thin. Included are a technical discussion of the computer model and a discussion of the method of approach used in implementing the computer model, as well as a step by step description of the computer model. The chemical kinetics model employed in the calculations is described. A complete description of vibrational energy transfer processes, together with a literature survey, is presented. The thermodynamic model which has been developed to allow treatment of the vibrational states of molecules, a discussion of the gas dynamics model, a discussion of the radiation model, and results and conclusions are presented.
