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  • Other Sources  (614)
  • NASA Technical Reports  (614)
  • ASTRONOMY  (372)
  • COMMUNICATIONS AND RADAR  (242)
  • 1980-1984  (614)
  • 1984  (614)
  • 1
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    Determination of the observation conditions of celestial bodies with the aid of the DISPO system (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The interactive system for determining the observation conditions of celestial bodies is described. A system of programs was created containing a part of the DISPO Display Interative System of Orbit Planning. The system was used for calculating the observatiion characteristics of Halley's comet during its approach to Earth in 1985-86.
    Keywords: ASTRONOMY
    Type: NAS 1.15:77632 , NASA-TM-77632
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Wave multiple scattering by a finite number of unclosed circular cylinders (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The boundary value problem of plane H-polarized electromagnetic wave multiple scattering by a finite number of unclosed circular cylinders is solved. The solution is obtained by two different methods: the method of successive scattering and the method of partial matrix inversion for simultaneous dual equations. The advantages of the successive scattering method are shown. Computer calculations of the suface currents and the total cross section are presented for the structure of two screens.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-77593 , NAS 1.15:77593 , PR-163
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A derivation of the boundary of the glistening region for rough surface scatter (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Keywords: COMMUNICATIONS AND RADAR
    Type: COMSAT Technical Review; 14; 165-167
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Giant step for communication satellite technology (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's communications program, which is concerned with advanced communications technology, reflects the need for operational communications satellite capacity beyond the capabilities of current technology and the unwillingness of private industry in the U.S. to undertake making the required long-range, high-risk technology advances. It is pointed out that current satellites will not satisfy the forecasted demand for additional capacity in the 1990s and beyond. Current technology exists primarily up to 18 GHz. Designing a communications satellite at each of the three major uplink/downlink frequency bands (C, Ku, and Ka, 6/4 GHz, 14/11 GHz, and 30/20 GHz, respectively) presents different program management and technical problems. Increasing frequency or power can be done only by intensive sustained research. This is the rationale for NASA to pursue the Advanced Communications Technology Satellite (ACTS) program.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Aerospace America (ISSN 0740-722X); 22; 54-57
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A new wave of communication satellites (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Satellites provide at present telephone, television, data, and business services on a national, regional, and international scale, and the geostationary arc has become crowded at C-band (6/4 GHz) and Ku-band (14/11 GHz) frequencies. The evolution and the present state of satellite communications are discussed along with details regarding the development of direct broadcast satellites, the position of Canada with respect to satellite communications, Japanese developments, ESA and Eutelsat, aspects of collaboration between France and Germany regarding communications satellites, the United Kingdom, and the Nordic countries.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Aerospace America (ISSN 0740-722X); 22; 42-45
    Format: text
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  • 6
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    IRAS observations of the diffuse infrared background (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: IRAS data reveal bright emission from interplanetary dust which dominates the celestial background at 12, 25, and 60 microns except near the galactic plane. At 100 microns, interplanetary dust emission is prominent only near the ecliptic plane; diffuse galactic emission is found over the rest of the sky. At the galactic poles, the observed brightness implies that A(v) is likely to be of order 0.1 mag. The angular variation of the zodiacal emission in the ecliptic plane and in the plane at elongation 90 deg, and an annual modulation of the ecliptic pole brightness, are generally consistent with previously determined interplanetary dust distributions.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L15-L18
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    The IRAS minisurvey (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Before the main Infrared Astronomical Satellite (IRAS) all-sky survey was started, a preliminary survey of 900 sq deg was carried out. Some results from this 'minisurvey' are given here. The completeness of the minisurvey at galactic latitudes from 20 to 40 deg drops sharply at flux densities below 0.4, 0.4, 0.5, and 2.5 Jy at 12, 25, 60, and 100 microns, respectively. The corresponding surface densities of point sources brighter than these flux levels are 1.1, 0.4, 0.65, and 1.25/sq deg, respectively. Outside the galactic plane, the majority of the sources at 12 and 25 microns are stars, while galaxies make up a significant proportion of 60 micron sources. The 100 micron band is dominated by emission from interstellar dust over much of the minisurvey area.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L7-L10
    Format: text
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  • 8
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    IRAS images of the galactic center (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Some preliminary IRAS results in the form of images at 12, 25, 60, and 100 microns of an 8 deg x 15 deg area around the galactic center are presented. These absolute intensity maps have unprecedented sensitivity combined with high angular resolution, wide field coverage, and large wavelength range. They give a broad view of the central galaxy revealing previously unseen details, especially in regions far from the central few arcmin. Well-defined infrared features in the nucleus correspond to the nuclear radio sources Sgr A, B2, C, and D. Extremely faint structures are detected, such as the cold molecular cloud associated with Sgr B2 which has never before been detected at wavelenths shorter than 40 microns.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 278; L57
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Lessons learned during the first year of the TDRSS (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The Tracking and Data Relay Satellite System (TDRSS) is the National Aeronautics and Space Administration's (NASA) newest capability for tracking and communicating with NASA's low-earth orbiting scientific and operational satellites. This support will eventually be provided through three identical satellites in geosynchronous orbit. They will relay data through a single ground station located in New Mexico. This paper discusses both the overall TDRSS concept and NASA's experience to date with the first of the three relay satellites on station.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 84-0687
    Format: text
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  • 10
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    Abundances in galactic H2 regions, 3: G25.4-0.2, G45.5+0.06, M8, S159 and DR22 (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Measurements of the ARII (6.99 microns), ArIII (8.99 microns), NeII (12.81 microns), SIII (18.71 microns), and SIV (10.51 microns) lines are presented for five compact HII regions along with continuum spectroscopy. From these data and radio data, lower limits to the elemental abundances of Ar, S, and Ne were deduced. The complex G25.4-0.2 is only 5.5 kpc from the galactic center, and is considerably overabundant in all these elements. Complex G45.5+0.06 is at seven kpc from the galactic center, and appears to be approximately consistent with solar abundance. The complex S159 in the Perseus Arm, at 12 kpc from the galactic center, has solar abundance, while M8 in the solar neighborhood may be somewhat overabundant in Ar and Ne. Complex DR 22, at 10 kpc from the galactic center in the Cygnus Arm, is overabundant in Ar. A summary of results from a series of papers on abundances is given.
    Keywords: ASTRONOMY
    Type: NASA-TM-85962 , A-9756 , NAS 1.15:85962 , PREPRINT-017
    Format: application/pdf
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