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  • Data
  • Other Sources  (2,764)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1,423)
  • Geophysics  (1,341)
  • 2000-2004  (1,329)
  • 1985-1989  (1,435)
Collection
Source
Keywords
Years
Year
  • 1
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    NASA's technology program for active remote sensing (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: In 1992, NASA will conduct a Space Shuttle-based lidar experiment at the fundamental, first, and second harmonic wavelengths of a Nd:YAG laser. A second, NASA U-2 aircraft-based experiment will measure water vapor vertical profiles in the lower atmosphere. In addition, NASA plans three space-based (polar orbit-platform) observatories, incorporating laser and electrooptics technologies covering the 280-10,000 nm spectrum, which will have long service lives with minimal servicing requirements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Airborne and Spaceborne Lasers for Terrestrial Geophysical Sensing; Jan 14, 1988 - Jan 15, 1988; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Stigmatically focusing partial pressure analyzer with dual chamber ion source (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The partial pressure analyzer developed has a high absolute sensitivity and high resolution. Interaction effects, as they occur in conventional partial pressure analyzers between the heating filament for the emission of electrons and the residual gas, are suppressed by removing the heating filament from the measurement area. The electron beam is generated in an auxiliary vacuum compartment, and passes subsequently through an aperture into the ionization compartment. The probability is small, therefore, that the presence of substances produced at the heating filament by chemical reactions and thermal decompositions will have disturbing effects. The high sensitivity and resolution of the instrument are obtained with the aid of an electron path configuration of unconventional characteristics.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TT-20059 , NAS 1.77:20059
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    JACEE long duration balloon flights (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: JACEE balloon-borne emulsion chamber detectors are used to observe the spectra and interactions of cosmic ray protons and nuclei in the energy range 1 to 100A TeV. Experiments with long duration mid-latitude balloon flights and characteristics of the detector system that make it ideal for planned Antarctic balloon flights are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Study of double exposure holography of the 3-dimensional character of the flow around an airfoil profile in a wind tunnel (1986)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The tridimensional character of the flow around a profile placed between walls is demonstrated and the incidence induced with the assistance of measurements of velocities by double exposure holography is evaluated. The values obtained by the theory of Menard are compared satisfactorily to the values obtained by this experiment.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-88486 , NAS 1.15:88486 , REPT-80/31
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Atmospheric Ozone 1985. Assessment of Our Understanding of the Processes Controlling Its Present Distribution and Change, Volume 2 (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Observations and interpretation of oxygen, hydrogen, nitrogen, and halogenated species are discussed.
    Keywords: Geophysics
    Type: NASA-TM-89238 , NAS 1.15:89238 , WMO-REPT-16-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    A Simulation of High Latitude F-Layer Instabilities in the Presence of Magnetosphere-Ionosphere Coupling (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A magnetic-field-line-integrated model of plasma interchange instabilities is developed for the high latitude ionosphere including magnetospheric coupling effects. We show that primary magnetosphere-ionosphere coupling effect is to incorporate the inertia of the magnetospheric plasma in the analysis. As a specific example, we present the first simulation of the E x B instability in the inertial regime, i.e., nu sub i omega where nu sub i is the ion-neutral collision frequency and omega is the wave frequency. We find that the inertial E x B instability develops in a fundamentally different manner than in the collisional case ni sub i omega. Our results show that striations produced in the inertial regime are spread and retarded by ion inertial effects, and result in more isotropic irregularities than those seen in the collisional case.
    Keywords: Geophysics
    Type: NASA-CR-176296 , NAS 1.26:176296 , AD-A157475 , NRL-5597
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Seven-wavelength pyrometer for determining surface temperature of ablation materials (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Results which were achieved by a seven-wavelength pyrometer last year are reported in this paper. These studies are directed toward the development of a method for determining the real surface temperature of thermal protection materials and for evaluating its emittance under varieties of reentry environment. A description of the data processing method and apparatus is also included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-77832 , NAS 1.15:77832
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Characteristics of the boat inductor for keeping liquid metal in the suspended state (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Characteristics of the boat inductor for keeping liquid metal in the suspended state are examined. Behavioral features of the liquid metal, and the suspension boundary of liquid metal in the lower position are discussed. It is concluded that the inductor can be used to crystallize metals in the suspended state.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-77816 , NAS 1.15:77816
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Auroral Substorm Time Scales: Seasonal and IMF Variations (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The time scales and phases of auroral substorm, activity are quantied in this study using the hemispheric power computed from Polar Ultraviolet Imager (UVI) images. We have applied this technique to several hundred substorm events and we are able to quantify how the characterist act, of substorms vary with season and IMF Bz orientation. We show that substorm time scales vary more strongly with season than with IMF Bz orientation. The recovery time for substorm. activity is well ordered by whether or not the nightside oral zone is sunlit. The recovery time scales for substorms occurring in the winter and equinox periods are similar and are both roughly a factor of two longer than in summer when the auroral oval is sunlit. Our results support the hypothesis that the ionosphere plays an active role in governing the dynamics of the aurora.
    Keywords: Geophysics
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Sensor technology (1988)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The objective is to provide necessary expertise and technology to advance space remote sensing of terrestrial, planetary, and galactic phenomena through the use of electromagnetic and electro-optic properties of gas, liquid, and solid state materials technology. The Sensor Technology Program is divided into two subprograms: a base research and development part and a Civil Space Technology Initiative (CSTI) part. The base research and development consists of research on artificially grown materials such as quantum well and superlattice structure with the potential for new and efficient means for detecting electromagnetic phenomena. Research is also being done on materials and concepts for detector components and devices for measuring high energy phenomena such as UV, X-, and gamma rays that are required observables in astrophysis and solar physics missions. The CSTI program is more mission driven and is balanced among four major disciplines: detector sensors; submillimeter wave sensors; LIDAR/DIAL sensors; and cooler technology.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA Information Sciences and Human Factors Program; p 203-223
    Format: text
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    NASA TECHNICAL REPORTS
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