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  • 11
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    The bow wave of Comet Giacobini-Zinner - ICE magnetic field observations (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Fitting of a Mach 2 shock surface to the ICE magnetic field data obtained near Comet Giacobini-Zinner has provided subsolar bow wave distances that infer neutral gas outflow rates comparable to previous measurements, and orientations of the bow wave symmetry axis that are consistent with the plasma measurements and motion of the comet relative to the solar wind. Mach values of 1.5-2 and transition thicknesses of the order of 10,000 km are inferred when the field magnitude and variance data are compared. Cross spectra of the transverse field components in and near the bow wave exhibit a peak near 0.01 Hz, or near the cyclotron frequency of ions from the water group. However, the level of turbulence is not consistent with that observed for similar configurations at planetary bow shocks.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 13; 243-246
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  • 12
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    Comet-solar wind interaction - Dynamical length scales and models (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: ICE magnetometer measurements at Comet Giacobini-Zinner and model simulations of comet-solar wind interactions are analyzed. The magnetometer data reveal the existence of intense hydromagnetic turbulence, a draping of the magnetic field lines to form a magnetotail, a weak shock, and a magnetic barrier region in the magnetosphere. The global models of the comet-solar wind interaction are described. The observed data and models are compared and good correlation is displayed.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 13; 239-242
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  • 13
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    Stresses in a nonhomogeneous elastic plate with a circular hole (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: FORTRAN program for stresses in nonhomogeneous elastic plate with circular hole
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 14
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    Load biaxiality and fracture - Synthesis and summary (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The question of load biaxiality strongly affecting almost all of the characteristics of brittle fracture behavior of a cracked body is investigated. Results of research published piecemeal over the years by the authors have shown that the stress and displacement fields, the elastic strain energy density, and the maximum shear stress near the crack tip are all altered by loads applied parallel to the crack, as are the angle of initial crack extension, the strain energy of the entire body, the fracture load, and the rate of fatigue crack growth. A synthesis and summary of this research is presented showing the shortcomings inherent in both Griffith's global energy rate theory for crack instability and Irwin's local crack-tip stress intensity theory for fracture toughness. In both theories only the tensile load perpendicular to the crack influences fracture behavior of the body.
    Keywords: STRUCTURAL MECHANICS
    Type: Engineering Fracture Mechanics (ISSN 0013-7944); 36; 4, 19; 537-549
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  • 15
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    Magnetic structure of the distant geotail from -60 to -220 earth radii - ISEE-3 (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: ISEE-3 magnetic-field measurements in the region of the geomagnetic tail from -80 to -220 earth radii are reported and discussed. A well-ordered field structure is found, comprising two 7-8-nT lobes separated by a plasma sheet, an embedded neutral sheet with significant By fields, and an intermittent plasma-sheet boundary layer with 5-nT-amplitude (peak-to-peak) electromagnetic waves. The plasma-sheet Bz distribution changes from principally northern orientation near the earth to an approximately equal north-south distribution at 200-220 earth radii. These findings are considered to be in general agreement with magnetic-reconnection models of the magnetosphere, with reconnection either throughout the region observed (in tearing-mode or plasmoid-formation models) or at a constant (about 220-earth-radii) or variable (40-80 to 220-earth-radii) X line (in X-line models).
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1-4
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  • 16
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    International Cometary Explorer encounter with Giacobini-Zinner - Magnetic field observations (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The vector helium magnetometer on the International Cometary Explorer observed the magnetic fields induced by the interaction of comet Giacobini-Zinner with the solar wind. A magnetic tail was penetrated about 7800 kilometers downstream from the comet and was found to be 10,000 kilometers wide. It consisted of two lobes, containing oppositely directed fields with strengths up to 60 nanoteslas, separated by a plasma sheet about 1000 kilometers thick containing a thin current sheet. The magnetotail was enclosed in an extended ionosheath characterized by intense hydromagnetic turbulence and interplanetary fields draped around the comet. A distant bow wave, which may or may not have been a bow shock, was observed at both edges of the ionoshpeath. Weak turbulence was observed well upstream of the bow wave.
    Keywords: ASTROPHYSICS
    Type: Science (ISSN 0036-8075); 232; 382-385
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  • 17
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    Giacobini-Zinner magnetotail - Ice magnetic field observations (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A well developed magnetotail with a diameter of about 10,000 km has been revealed 7800 km downstream of the nucleus of Comet Giacobini-Zinner by International Cometary Explorer magnetic field observations. The tail is composed of two lobes of opposite magnetic polarity that are separated by an approximately 1500 km-thick plasma sheets. The field magnitude increases by a factor of 2 between the outer portions of the lobe and the central regions, where peak fields of about 60 nT were measured. Flaring is lowest in the high field regions of the central tail and greatest in the outer portions of the lobes, where minimum variance analyses on the magnetopause crossings furnishes flare angles of 20-40 deg. The Alfven field line draping model of type I cometary tails is confirmed by these observations.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 13; 283-286
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  • 18
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    The effectiveness of using real-time eye scanning information for pilot training (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A study to evaluate the idea of providing pilots feedback on their scan behavior as an instrumentional training aid was conducted jointly by NASA, Piedmont Aviation, and Old Dominion University. The study used Langley's oculometer system to provide a real-time display of the trainee's scan to the instructor pilot in the aft part of the Boeing 737 training simulator at Piedmont. The trainees' scan behavior was also video-taped for viewing by the instructor and trainee after each training session. Based on qualitative data obtained during the study, scan behavior feedback was an effective tool for pilot training.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
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  • 19
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    MARINER II- PRELIMINARY REPORTS ON MEASUREMENTS OF VENUS. MICROWAVE RADIOMETERS (1963)
    In:  Other Sources
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    Publication Date: 2011-08-10
    Description: Description of the radiometer carried by the mariner ii space probe
    Keywords: MACHINE ELEMENTS AND PROCESSES
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  • 20
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    Spectral observations of Jupiter in the frequency interval 18.5-24.0 GHz - 1968 (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Jupiter brightness temperature values and standard deviations from EHF radio telescopic observations
    Keywords: SPACE SCIENCES
    Type: ; DIOTEKHNIKA (
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