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  • Other Sources  (161)
  • COMMUNICATIONS  (105)
  • ASTRONOMY
  • EARTH RESOURCES AND REMOTE SENSING
  • 1970-1974  (161)
Collection
  • Other Sources  (161)
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Year
  • 1
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    Microwave maps of the polar ice of the earth (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Synoptic views of the entire polar regions of earth have been obtained free of the usual persistent cloud cover using a scanning microwave radiometer operating at a wavelength of 1.55 cm on board the Nimbus-5 satellite. Three different views at each pole are presented utilizing data obtained at approximately one-month intervals from December 1972 to February 1973. Large discrepancies exist between the long-term ice cover depicted in various atlases and the actual extent of the canopies. The distribution of multiyear ice in the north polar region is markedly different from that predicted by existing ice dynamics models. Irregularities in the edge of the Antarctic sea ice pack occur that have neither been observed previously nor anticipated. The brightness temperatures of the Greenland and Antarctic glaciers show interesting contours probably related to the ice and snow morphologic structure.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: American Meteorological Society; vol. 55
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Radiation resistance of a small filamentary loop antenna in a cold multicomponent magnetoplasma (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Radiation resistance of small filamentary loop antenna in cold collisionless uniform multicomponent magnetoplasma, assuming uniform current distribution along loop
    Keywords: COMMUNICATIONS
    Type: ; ROBLEMS OF THE THEOR
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Vlf/elf radiation patterns of arbitrarily oriented electric and magnetic dipoles in a cold lossless multicomponent magnetoplasma. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: With the use of a power integral formulation, a study is made of the vlf/elf radiation patterns of arbitrarily oriented electric and magnetic dipoles in a cold lossless multicomponent magnetoplasma. Expressions for the ray patterns are initially developed that apply for arbitrary values of driving frequency, static magnetic-field strength, plasma density, and composition. These expressions are subsequently specialized to vlf/elf radiation in a plasma modeled on the magnetosphere. A series of representative pattern plots are presented for frequencies between the proton and electron gyrofrequencies. These patterns illustrate the fact that focusing effects that arise from the geometrical properties of the refractive index surface tend to dominate the radiation distribution over the entire range from the electron gyrofrequency to 4.6 times the proton gyrofrequency. It is concluded that focusing effects should be of significant importance in the design of a vlf/elf satellite transmitting system in the magnetosphere.
    Keywords: COMMUNICATIONS
    Type: Journal of Geophysical Research; 77; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The effects of soil moisture and plant morphology on the radar backscatter from vegetation (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of experimental studies on the backscattering properties of corn, milo, soybeans and alfalfa are presented. The measurements were made during the summer of 1973 over the 8 to 18 GHz frequency band. The data indicate that soil moisture estimation is best accomplished at incidence angles near nadir with lower frequencies, while crop discrimination is best accomplished using two frequencies at incidence angles ranging from 30 deg to 65 deg. It is also shown that temporal plant morphology variations can cause extreme variations in the values of the scattering coefficients. These morphological changes can be caused by growth, heavy rain and in the case of alfalfa, harvesting.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-141684 , RSL-TR-177-51
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    On vlf radiation resistance of an electric dipole in a cold magnetoplasma (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: VLF radiation resistance of short filamentary electric dipole at arbitrary angle to magnetic field in cold uniform plasma, using full wave theory
    Keywords: COMMUNICATIONS
    Type: ; SEARCH(
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Research and investigation of geology, mineral, and water resources of Maryland (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The authors have identified the following significant results. Field work in Baltimore County revealed that the signature returns of serpentinitic and nonserpentinitic rocks correlates with the vegetation cover and land use pattern. In Maryland Piedmont, bedrock lithology and structure are enhanced only to the extent that land use is geologically dictated. Two prominent sets of linear features are detected on ERTS-1 imagery at N 45 deg E and N 20 deg E. Beaches of Chesapeake Bay are classified as broad and narrow beaches based on the width of the backshore zone. It is shown by comparing historical shorelines of Ocean City, from the inlet to the Maryland-Delaware line that reversal zones of erosion and accretion occur at different locations for different periods. High reflectance levels (high marsh-high topographic areas) for the lower Eastern Shore are found to be distributed as two distinct trending linear ridge systems. Observations of MSS band 5 dated 9 April 1974 exhibited an unique sedimentation pattern for Chesapeake Bay. Following a 1.5 inch rainfall, heavy concentration of suspended sediments is observed on the imagery, particularly in the area of the turbidity maximum.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E75-10314 , NASA-CR-142916
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Multiple beam communicating satellites with remote beam steering and beam shaping (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Multiple beam phased arrays are shown to enhance the performance of several anticipated geostationary communications satellite programs because of the greater efficiency and flexibility of the phased array. It is shown that the efficiency of arrays can be significantly greater than corresponding multiple feed dishes and that the problems of crossover loss and performance degradation with parts failures are thereby avoided. On an open loop basis, it is shown that a multiple beam array can provide higher EIRP over a coverage area. On a closed loop basis, it is shown that an adaptive array can provide nulling of unwanted signals while simultaneously providing gain in the direction of a desired signal.
    Keywords: COMMUNICATIONS
    Type: AIAA PAPER 72-566
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Observations of naturally occurring vlf and man-made hf plasma waves in auroral regions of the ionosphere (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Polar ionosphere auroral oval position detection by satellite observations of naturally occurring VLF and man-made HF plasma waves
    Keywords: COMMUNICATIONS
    Type: NSSDC-ID-65-081A-02-PM , PLASMA WAVES IN SPACE AND IN THE LAB., NATO, ADVANCED STUDY INST.; Apr 17, 1968 - Apr 26, 1968; ROROS; NORWAY
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Application of ERTS-1 data to the protection and management of New Jersey's coastal environment (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Quasi-operational information products for coastal zone management have been prepared using ERTS-1 imagery and collateral aerial photography. These products were applied to the practical regulation, protection, and management of New Jersey's coastal environment. Procedures were developed for the operational use of ERTS-1 data products within New Jersey's Department of Environmental Protection. Successful analysis and product preparation for operational needs centered on four major coastal resource problem areas: (1) detection of environmental changes in coastal areas, (2) siting of ocean outfalls, (3) monitoring of offshore waste disposal, and (4) calculation of recession rates along the Atlantic Shore. The utility and monetary benefits derived from ERTS and aircraft imagery for each problem area have been determined. The NJDEP estimates the possibility of $620,000 yearly savings through the use of an operational ERTS system and a one-time savings of $2.8 million on current or planned projects if a truly operational ERTS type satellite were available.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E75-10190 , NASA-CR-142339
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Skylab S-193 altimeter experiment performance, results and applications (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description of the Skylab altimeter instrument system along with the appropriate system error model is presented. The data processing flow, orbit computation, and topographic recovery techniques are discussed. Some data analysis results are presented which indicate excellent correlation with underwater topographic features. In addition, results are shown which indicate that the instrument performance was as expected.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Symposium on Applications of Marine Geodesy; Jun 03, 1974 - Jun 05, 1974; Columbus, OH
    Format: text
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    NASA TECHNICAL REPORTS
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