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  • 1985-1989  (6)
  • 1975-1979  (9)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Macroevolutionary Comparisons of Host and Parasite Phylogenies (1988)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 19 (1988), S. 235-259 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.19.110188.001315
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Macroevolutionary Comparisons of Host and Parasite Phylogenies (1988)
    Annual Reviews
    Details
    Publication Date: 1988-11-01
    Print ISSN: 0066-4162
    Topics: Biology
    Published by Annual Reviews
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    PAPER CURRENT
  • 3
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    Manmade orbital debris studies at NASA Langley (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: In the past, flight experiments to define the meteoroid environment near the Earth and in interplanetary space were undertaken. The effectiveness of meteoroid bumpers was investigated. These flight experiments were aboard Pioneer 10, Pioneer 11, and Explorer 46. Hypervelocity impact tests were conducted in the laboratory to study protective structures and the composition of meteoroids from the hundreds of meteor spectra obtained. It was also found that manmade debris presented a similar hazard to spacecraft near the Earth. An assessment of that hazard is made in this paper. An analysis of the collision probability problem with much attention given to the population of small untrackable fragments created during explosions is presented.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA. Lyndon B. Johnson Space Center Orbital Debris; p 45-68
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Limb-darkening functions for the earth-atmosphere system over desert scenes (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Alongtrack data collected with the Earth Radiation Budget Experiment (ERBE) scanner instrument were used to study an observed limb-darkening phenomenon. A numerical model developed for the longwave exitance as a function of the SZA has agreed well with ERBE data, indicating that the atmosphere is in adiabatic, rather than radiative, equilibrium. A corrected form of the model has been defined for SZA over 60 deg. The model was used to parameterize diurnal data for the Sahara-Saudi and Australian deserts.
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    First diurnal results from the Earth Radiation Budget Experiment (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Early results are reported from measurements of the diurnal variability of total and clear-sky regional radiative parameters by the ERBE instruments on one dedicated satellite and the polar-orbiting NOAA-9 satellite. Attention is focused on November 1984, the first complete data set. The scene is identified in terms of longwave and shortwave radiances (daytime) or longwave radiation (night) and maximum likelihood estimates carried out with the addition of Earth Radiation Budget data from Nimbus-7. Analysis of the first data set revealed significant differences between total and clear-sky albedo. The clear-sky and LRE both reach maximum around noon and minimum values at midnight.
    Keywords: GEOPHYSICS
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    NASA TECHNICAL REPORTS
  • 6
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    Development of algorithms for understanding the temporal and spatial variability of the earth's radiation balance (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A brief description is given of how temporal and spatial variability in the earth's radiative behavior influences the goals of satellite radiation monitoring systems and how some previous systems have addressed the existing problems. Then, results of some simulations of radiation budget monitoring missions are presented. These studies led to the design of the Earth Radiation Budget Experiment (ERBE). A description is given of the temporal and spatial averaging algorithms developed for the ERBE data analysis. These algorithms are intended primarily to produce monthly averages of the net radiant exitance on regional, zonal, and global scales and to provide insight into the regional diurnal variability of radiative parameters such as albedo and long-wave radiant exitance. The algorithms are applied to scanner and nonscanner data for up to three satellites. Modeling of dialy shortwave albedo and radiant exitance with satellite samling that is insufficient to fully account for changing meteorology is discussed in detail. Studies performed during the ERBE mission and software design are reviewed. These studies provide quantitative estimates of the effects of temporally sparse and biased sampling on inferred diurnal and regional radiative parameters. Other topics covered include long-wave diurnal modeling, extraction of a regional monthly net clear-sky radiation budget, the statistical significance of observed diurnal variability, quality control of the analysis, and proposals for validating the results of ERBE time and space averaging.
    Keywords: GEOPHYSICS
    Type: Reviews of Geophysics (ISSN 8755-1209); 24; 422-438
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    NASA TECHNICAL REPORTS
  • 7
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    An introduction to orbit dynamics and its application to satellite-based earth monitoring systems (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The long term behavior of satellites is studied at a level of complexity suitable for the initial planning phases of earth monitoring missions. First-order perturbation theory is used to describe in detail the basic orbit dynamics of satellite motion around the earth and relative to the sun. Surface coverage capabilities of satellite orbits are examined. Several examples of simulated observation and monitoring missions are given to illustrate representative applications of the theory. The examples stress the need for devising ways of maximizing total mission output in order to make the best possible use of the resultant data base as input to those large-scale, long-term earth monitoring activities which can best justify the use of satellite systems.
    Keywords: ASTRODYNAMICS
    Type: NASA-RP-1009 , L-11710
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Mission analysis to define satellite orbits for earth radiation budget measurements (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Information is presented concerning the number of satellites, the orbit altitude, and the inclinations which will provide the spatial and temporal earth coverage required for accurate radiation measurements on regional, zonal, and global scales. Measurement considerations are discussed and an analysis is conducted regarding the selection of suitable orbit parameters. Attention is also given to the results of a simulation model study for the determination of the radiation which can be measured by satellite sensors in different orbits.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 76-811 , Astrodynamics Conference; Aug 18, 1976 - Aug 20, 1976; San Diego, CA
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    NASA TECHNICAL REPORTS
  • 9
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    Mission analysis for satellite measurements of stratospheric constituents by solar occultation (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Orbital characteristics and launch vehicle requirements for a solar occultation experiment measuring atmospheric constituents, such as aerosols or ozone, during the Nimbus-G and Applications Explorer Missions are analyzed. The experiment to be flown is basically a sun photometer which measures the spectral attenuation of solar radiation by the earth's atmosphere during spacecraft sunrise and sunset, yielding two aerosol and/or ozone stratospheric profiles per orbit. The tangent latitudes and longitudes as well as frequency of these measurements are analyzed for various spacecraft orbits to define maximum geographical coverage capability. Results indicate that a 50 deg inclined orbit for Applications Explorer provides latitude coverage from approximately 70 deg north to 70 deg south every 2-1/2 weeks. A high-moon, sun-synchronous orbit with an inclination of 99 deg for Nimbus-G will provide for coverage of occultation measurements at high latitudes near the polar regions (i.e., 64 to 80 deg north and south). The solar pointing requirements of the experiment in terms of yaw and pitch angles are also defined.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 75-57 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 20, 1975 - Jan 22, 1975; Pasadena, CA
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    NASA TECHNICAL REPORTS
  • 10
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    Statistical sampling analysis for stratospheric measurements from satellite missions (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Earth orbiting satellite experiments can be designed to measure stratospheric constituents such as ozone by utilizing remote sensing techniques. Statistical analysis techniques, mission simulation and model development have been utilized to develop a method for analyzing various mission/sensor combinations. Existing and planned NASA satellite missions such as Nimbus-4 and G, and Stratospheric Aerosol and Gas Experiment-Application Explorer Mission (SAGE-AEM) have been analyzed to determine the ability of the missions to adequately sample the global field.
    Keywords: GEOPHYSICS
    Type: In: Joint Conference on Sensing of Environmental Pollutants; Nov 06, 1977 - Nov 11, 1977; New Orleans, LA
    Format: text
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    NASA TECHNICAL REPORTS
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