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  • Other Sources  (27)
  • COMMUNICATIONS  (14)
  • LUNAR AND PLANETARY EXPLORATION  (6)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (5)
  • ASTROPHYSICS  (2)
  • 1
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    Preliminary antenna radiation pattern calculations for the ATS F flex rib reflector (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: Computer program for calculating radiation pattern of ATS 6 flexible rib-reinforced reflector
    Keywords: COMMUNICATIONS
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 259-262
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Sunward spike and equatorial plane of Halley's Comet (1986)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Photographs from late April until at least early June 1986 of comet Halley show a narrow spike in the Sun's direction. It extends to distances of at least 700,000 km from the nucleus in projection onto the sky on computer processed photographs. The spike is composed of dust and its enormous sunward extent (compared to other dust features) suggests an anomalously high ratio of particle ejection velocity to solar radiation pressure. The implied grains are either dielectric or slightly absorbing and much less than 1 micron in size, which are undetectable optically, unless Earth is located in or very near a plane of their concentration. The only plane to which these grains can possibly be confined for long is the equatorial plane of the nucleus, especially when the obliquity is small. Accordingly, the spike's position as a function of time contains information on the comet's spin axis.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus; p 177-181
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Space station impact experiments (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Four processes serve to illustrate potential areas of study and their implications for general problems in planetary science. First, accretional processes reflect the success of collisional aggregation over collisional destruction during the early history of the solar system. Second, both catastrophic and less severe effects of impacts on planetary bodies survivng from the time of the early solar system may be expressed by asteroid/planetary spin rates, spin orientations, asteroid size distributions, and perhaps the origin of the Moon. Third, the surfaces of planetary bodies directly record the effects of impacts in the form of craters; these records have wide-ranging implications. Fourth, regoliths evolution of asteroidal surfaces is a consequence of cumulative impacts, but the absence of a significant gravity term may profoundly affect the retention of shocked fractions and agglutinate build-up, thereby biasing the correct interpretations of spectral reflectance data. An impact facility on the Space Station would provide the controlled conditions necessary to explore such processes either through direct simulation of conditions or indirect simulation of certain parameters.
    Keywords: ASTROPHYSICS
    Type: Space Station Planetology Experiments (SSPEX); 5 p
    Format: application/pdf
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  • 4
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    Experimental investigation of crater growth dynamics (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This work is a continuation of an ongoing program whose objective is to perform experiments and to develop scaling relationships for large-body impacts onto planetary surfaces. The centrifuge technique is used to provide experimental data for actual target materials of interest. With both power and gas guns mounted on the rotor arm, it is possible to match various dimensionless similarity parameters, which have been shown to govern the behavior of large-scale impacts. The development of the centrifuge technique has been poineered by the present investigators and is documented by numerous publications, the most recent of which are listed below. Understanding the dependence of crater size upon gravity has been shown to be key to the complete determination of the dynamic and kinematic behavior of crater formation as well as ejecta phenomena. Three unique time regimes in the formation of an impact crater have been identified.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-176392 , NAS 1.26:176392
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  • 5
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    Centrifuge Impact Cratering Experiments (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-08
    Description: The kinematics of crater growth, impact induced target flow fields and the generation of impact melt were determined. The feasibility of using scaling relationships for impact melt and crater dimensions to determine impactor size and velocity was studied. It is concluded that a coupling parameter determines both the quantity of melt and the crater dimensions for impact velocities greater than 10km/s. As a result impactor radius, a, or velocity, U cannot be determined individually, but only as a product in the form of a coupling parameter, delta U micron. The melt volume and crater volume scaling relations were applied to Brent crater. The transport of melt and the validity of the melt volume scaling relations are examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 167-169
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  • 6
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    Active spacecraft potential control: An ion emitter experiment (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The cluster spacecraft are instrumented with ion emitters for charge neutralization. The emitters produce indium ions at 6 keV. The ion current is adjusted in a feedback loop with instruments measuring the spacecraft potential. The system is based on the evaporation of indium in the apex field of a needle. The design of the active spacecraft potential control instruments, and the ion emitters is presented.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: ESA, The Cluster Mission: Scientific and Technical Aspects of the Instruments; p 95-102
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  • 7
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    Cluster: A fleet of four spacecraft to study plasma structures in three dimensions (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The four Cluster spacecraft are spin stabilized spacecraft which are designed and built under stringent requirements as far as electromagnetic cleanliness is concerned. Conductive surfaces and low electromagnetic background noise are mandatory for accurate electric field and cold plasma measurements. The mission is implemented in collaboration between ESA and NASA. A Russian mission will be closely coordinated with Cluster.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: ESA, The Cluster Mission: Scientific and Technical Aspects of the Instruments; p 7-13
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  • 8
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    An analysis of simultaneous beam formation by means of passive scattering matrices and uniform planar antenna arrays (1964)
    In:  CASI
    Details
    Publication Date: 2019-05-23
    Description: Simultaneous beam formation by passive scattering matrices and uniform planar arrays
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-55126 , X-525-64-343
    Format: application/pdf
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  • 9
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    Computed radiation patterns for a dual-plane amplitude-sensing monopulse antenna using an electronic boresight scanning technique (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Computed radiation patterns for dual plane, amplitude sensing monopulse radar antenna using electronic boresight scanning device
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-55506 , X-525-66-84
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  • 10
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    A chain matrix analysis of an electronic boresight scanning technique for a dual-plane amplitude-sensing monopulse antenna (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Chain matrix analysis of electronic boresight scanning technique for dual-plane amplitude- sensing monopulse antenna
    Keywords: COMMUNICATIONS
    Type: NASA-TM-X-55540 , X-525-65-300
    Format: application/pdf
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