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  • Other Sources  (3,742)
  • 1970-1974  (3,630)
  • 1965-1969
  • 1955-1959
  • 1950-1954  (112)
  • 1935-1939
  • 1974  (3,630)
  • 1952  (112)
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  • 1970-1974  (3,630)
  • 1965-1969
  • 1955-1959
  • 1950-1954  (112)
  • 1935-1939
Year
  • 1
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    The GISS model of the global atmosphere (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A description and numerical results are presented for a global atmospheric circulation model developed at the Goddard Institute for Space Studies (GISS). The model version described is a 9-level primitive-equation model in sigma coordinates. It includes a realistic distribution of continents, oceans and topography. Detailed calculations of energy transfer by solar and terrestrial radiation make use of cloud and water vapor fields calculated by the model. The model hydrologic cycle includes two precipitation mechanisms: large-scale supersaturation and a parameterization of subgrid-scale cumulus convection. Results are presented both from a comparison of the 13th to the 43rd days (January) of one integration with climatological statistics, and from five short-range forecasting experiments. In the extended integration, the near-equilibrium January-mean model atmosphere exhibits an energy cycle in good agreement with observational estimates, together with generally realistic zonal mean fields of winds, temperature, humidity, transports, diabatic heating, evaporation, precipitation, and cloud cover.
    Keywords: METEOROLOGY
    Type: Journal of the Atmospheric Sciences; 31; Jan. 197
    Format: text
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  • 2
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    The comparative evaluation of ERTS-1 imagery for resource inventory in land use planning (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Multidiscipline team interpretation and mapping of resources for Crook County is complete on 1:250,000 scale enlargements of ERTS imagery and 1:120,000 hi-flight photography. Maps of geology, soils, vegetation-land use and land resources units were interpreted to show limitations, suitabilities, and geologic hazards for land use planning. Mapping of lineaments and structures from ERTS imagery has shown a number of features not previously mapped in Oregon. A multistage timber inventory of Ochoco National Forest was made, using ERTS images as the first stage. Inventory of forest clear-cutting practices was successfully demonstrated with color composites. Soil tonal differences in fallow fields correspond with major soil boundaries in loess-mantled terrain. A digital classification system used for discriminating natural vegetation and geologic material classes was successful in separating most major classes around Newberry Caldera, Mt. Washington, and Big Summit Prairie.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E75-10416 , NASA-CR-143406
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Application of ERTS-1 imagery to state wide land information system in Minnesota (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10682 , NASA-CR-139247
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A dual frequency radar for ocean roughness sampling (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A microwave technique for determining the roughness (rms wave height) of a randomly varying air-water interface has been developed theoretically, verified with laboratory wavetank studies and is currently being implemented for ocean surface measurements in a series of applications flight experiments. These aircraft observations will be near the Chesapeake Light Tower and will include a range of altitudes and sea conditions. The measurement concept involves cross-correlating the envelope fluctuations on two received carriers that are monochromatic when transmitted in a normal direction to the interface and are observed in a backscatter direction after reflection by the large number of randomly distributed specular points on the surface. The measured correlation coefficient (normalized covariance) as a function of carrier frequency separation will depend on the surface roughness, specifically the probability density function of the specular point height. Details of the flight system are discussed, and preliminary flight results are presented.
    Keywords: OCEANOGRAPHY
    Type: Specialist Meeting on Microwave Scattering and Emission from the Earth; Sep 23, 1974 - Sep 26, 1974; Berne; Switzerland
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Observations at Venus encounter by the plasma science experiment on Mariner 10 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Preliminary results from the rearward-looking electrostatic analyzer of the plasma science experiment during the Mariner 10 encounter with Venus are described. They show that the solar-wind interaction with the planet probably involves a bow shock rather than an extended exosphere, but that this is not a thin boundary at the point where it was crossed by Mariner 10. An observed reduction in the flux of electrons with energies greater than 100 electron volts is interpreted as evidence for some direct interaction with the exosphere. Unusual intermittent features observed downstream of the planet indicate the presence of a comet-like tail hundreds of scale lengths in length.
    Keywords: SPACE SCIENCES
    Type: Science; 183; Mar. 29
    Format: text
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  • 6
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    Observations at Mercury encounter by the plasma science experiment on Mariner 10 (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A fully developed bow shock and magnetosheath were observed near Mercury, providing unambiguous evidence for a strong interaction between Mercury and the solar wind. Inside the sheath there is a distinct region analogous to the magnetosphere or magnetotail of earth, populated by electrons with lower density and higher temperature than the electrons observed in the solar wind or magnetosheath. At the time of encounter, conditions were such that a perpendicular shock was observed on the inbound leg and a parallel shock was observed on the outbound leg of the trajectory, and energetic plasma electron events were detected upstream from the outbound shock crossing. The interaction is most likely not atmospheric, but the data clearly indicate that the obstacle to solar wind flow is magnetic, either intrinsic or induced.
    Keywords: SPACE SCIENCES
    Type: Science; 185; July 12
    Format: text
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  • 7
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    Measurements of the structure and circulation of the stratosphere and mesosphere, 1971-2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Complete data from a total of 43 meteorological rocket soundings of the stratosphere and mesosphere conducted from Barrow, Alaska; Churchill, Canada; Wallops Island Va.; and Kourou, French Guiana are presented. These data consist of temperature, pressure, density, and wind profiles from 35 acoustic grenade soundings that cover the 30 to 90 km altitude range, and temperature, pressure, and density profiles from 8 pitot probe soundings that cover the 25 to 120 km altitude range. Errors for each of the 35 acoustic grenade soundings are also included.
    Keywords: METEOROLOGY
    Type: NASA-TR-R-416 , G-7408
    Format: application/pdf
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  • 8
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    An evaluation of the use of ERTS-1 satellite imagery for grizzly bear habitat analysis (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Improved classification and mapping of grizzly habitat will permit better estimates of population density and distribution, and allow accurate evaluation of the potential effects of changes in land use, hunting regulation, and management policies on existing populations. Methods of identifying favorable habitat from ERTS-1 multispectral scanner imagery were investigated and described. This technique could reduce the time and effort required to classify large wilderness areas in the Western United States.
    Keywords: BIOSCIENCES
    Type: PAPER-E11 , NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. B; p 1653-1670
    Format: text
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  • 9
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    Flight investigation of manual and automatic VTOL decelerating instrument approaches and landings (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A flight investigation was undertaken to study the problems associated with manual and automatic control of steep, decelerating instrument approaches and landings under simulated instrument conditions. The study was conducted with a research helicopter equipped with a three-cue flight-director indicator. The scope of the investigation included variations in the flight-director control laws, glide-path angle, deceleration profile, and control response characteristics. Investigation of the automatic-control problem resulted in the first automated approach and landing to a predetermined spot ever accomplished with a helicopter. Although well-controlled approaches and landings could be performed manually with the flight-director concept, pilot comments indicated the need for a better display which would more effectively integrate command and situation information.
    Keywords: NAVIGATION
    Type: NASA-TN-D-7524 , L-9311
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Six-color photometric observations made during Saturn's 1972/73 opposition enable us to separate the solar phase and orbital phase contributions to the observed light variations of Iapetus, Titan, Rhea, Dione and Tethys. Titan shows no orbital variations, but has phase coefficients which range from negligible values in the infrared to 0.014 mag/deg in the ultraviolet. Rhea has a bright leading side, a light curve amplitude of about 0.2 mag, and surprisingly large phase coefficients. Combined with other available information, the observations suggest a very porous, texturally complex surface layer. Dione has a leading side which is a few tenths of a magnitude brighter than the trailing side, but the light curve amplitude has little wavelength dependence and the phase coefficients are significantly smaller than those of Rhea, suggesting a less intricate surface texture. The leading side of Tethys is probably a few tenths of a magnitude brighter than the trailing side. Our Iapetus observations generally supplement the earlier work by Millis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Nov. 197
    Format: text
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