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  • 1
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    Large-Scale Structure of Magnetospheric Plasma (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Recent investigations of magnetospheric plasma structure are summarized under the broad categories of empirical models, transport across boundaries, formation, and dynamics of the plasma sheet. This report reviews work in these areas during the period 1991 to 1993. Fully three-dimensional empirical models and simulations have become important contributors to our understanding of the magnetospheric system. Some new structural concepts have appeared in the literature: the 'entry boundary' and 'geo-pause', the plasma sheet 'region 1 vortices', the 'low-energy layer', the 'adia-baticity boundary' or 'wall region', and a region in the tail to which we refer as the 'injection port'. Traditional structural concepts have also been the subject of recent study, notably the plasmapause, the magnetopause, and the plasma sheet. Significant progress has been made in understanding the nature of plasma sheet formation and dynamics, but the acceleration of electrons to high energy remains somewhat mysterious.
    Keywords: Astrophysics
    Type: NASA-TM-111866 , NAS 1.15:111866
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  • 2
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    Joining precipitation-hardened nickel-base alloys by friction welding (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Solid state deformation welding process, friction welding, has been developed for joining precipitation hardened nickel-base alloys and other gamma prime-strengthened materials which heretofore have been virtually unweldable. Method requires rotation of one of the parts to be welded, but where applicable, it is an ideal process for high volume production jobs.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-11514
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  • 3
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    Evidence for Spiral Magnetic Structures at the Magnetopause: A Case for Multiple Reconnections (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: We analyze plasma structures within the low latitude boundary layer (LLBL) observed by the lnterball Tail spacecraft under southward interplanetary magnetic field. Ion velocity distributions observed in the LLBL under these conditions fall into three categories: (a) D-shaped distributions, (b) ion velocity distributions consisting of two counterstreaming magnetosheath-type, and (c) distributions with three components where one of them has nearly zero velocity parallel to magnetic field (VlI), while the other two are counter-streaming components. D-shaped ion velocity distributions (a) correspond to magnetosheath plasma injections into reconnected flux tubes, as influenced by spacecraft location relative to the reconnection site. Simultaneous counter-streaming injections (b) suggest multiple reconnections. Three-component ion velocity distributions (c) and theii evolution with decreasing number density in the LLBL are consistent v behavior expected on long spiral flux tube islands at the magnetopaus as has been proposed and found to occur in magnetopause simulatior We interpret these distributions as a natural consequence of the formation of spiral magnetic flux tubes consisting of a mixture of alternating segments originating from the magnetosheath and magnetospheric plasmas. We suggest that multiple reconnections pla! an important role in the formation of the LLBL.
    Keywords: Astrophysics
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  • 4
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    Fabrication of hollow ball bearings by diffusion welding (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two steel hemispheres are diffusion welded in an atmosphere of 0.00002 torr at a temperature of 2130 degrees F for 4 hours with a pressure of 4 psi holding the hemispheres together. Weld is accomplished with only microdeformation.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-11026
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  • 5
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    Solid state welding of dispersion-strengthened nickel alloys (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Two-step solid state welding cycle applied to carefully prepared surfaces of an unrecrystallized alloy prevents loss of parent-metal strength at weld joint of dispersion-strengthened, nickel-chromium alloy.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-11388
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  • 6
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    Practical method of diffusion-welding steel plate in air (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Method is ideal for critical service requirements where parent metal properties are equaled in notch toughness, stress rupture and other characteristics. Welding technique variations may be used on a variety of materials, such as carbon steels, alloy steels, stainless steels, ceramics, and reactive and refractory materials.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-11387
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  • 7
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    Short Large-Amplitude Magnetic Structures (SLAMS) at Venus (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: We present the first observation of magnetic fluctuations consistent with Short Large-Amplitude Magnetic Structures (SLAMS) in the foreshock of the planet Venus. Three monolithic magnetic field spikes were observed by the Venus Express on the 11th of April 2009. The structures were approx.1.5-〉11s in duration, had magnetic compression ratios between approx.3-〉6, and exhibited elliptical polarization. These characteristics are consistent with the SLAMS observed at Earth, Jupiter, and Comet Giacobini-Zinner, and thus we hypothesize that it is possible SLAMS may be found at any celestial body with a foreshock.
    Keywords: Astrophysics
    Type: GSFC.JA.7467.2012
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  • 8
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    Magnetic Reconnection and Modification of the Hall Physics Due to Cold Ions at the Magnetopause (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observations by the four Magnetospheric Multiscale spacecraft are used to investigate the Hall physics of a magnetopause magnetic reconnection separatrix layer. Inside this layer of currents and strong normal electric fields, cold (eV) ions of ionospheric origin can remain frozen-in together with the electrons. The cold ions reduce the Hall current. Using a generalized Ohms law, the electric field is balanced by the sum of the terms corresponding to the Hall current, the v x B drifting cold ions, and the divergence of the electron pressure tensor. A mixture of hot and cold ions is common at the subsolar magnetopause. A mixture of length scales caused by a mixture of ion temperatures has significant effects on the Hall physics of magnetic reconnection.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN41004 , Geophysical Research Letters (ISSN 0094-8276); 43; 13; 6705–6712
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  • 9
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    Shift of the Magnetopause Reconnection Line to the Winter Hemisphere Under Southward IMF Conditions: Geotail and MMS Observations (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: At 02:13 UT on 18 November 2015 when the geomagnetic dipole was tilted by -27deg, the MMS spacecraft observed southward reconnection jets near the subsolar magnetopause under southward and dawnward interplanetary magnetic field conditions. Based on four-spacecraft estimations of the magnetic field direction near the separatrix and the motion and direction of the current sheet, the location of the reconnection line was estimated to be approx.1.8 R(sub E) or further northward of MMS. The Geotail spacecraft at GSM Z approx. 1.4 R(sub E) also observed southward reconnection jets at the dawnside magnetopause 30-40 min later. The estimated reconnection line location was northward of GSM Z approx.2 R(sub E). This crossing occurred when MMS observed purely southward magnetic fields in the magnetosheath. The simultaneous observations are thus consistent with the hypothesis that the dayside magnetopause reconnection line shifts from the subsolar point toward the northem (winter) hemisphere due to the effect of geomagnetic dipole tilt.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN41266 , Geophysical Research Letters (ISSN 0094-8276); 43; 11; 5581–5588
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  • 10
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    Welding and Brazing Silicon Carbide (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Hot isostatic pressing and conventional furnace brazing effective under right conditions. Study performed showed feasibility of welding SiC using several welding and brazing techniques. Use of SiC improves engine efficiency by allowing increase in operating temperature. SiC successfully hot-pressure-welded at 3,550 degrees F (1,950 degrees C) in argon. Refinements of solid-state welding and brazing procedures used sufficient for some specific industrial applications.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-14251 , NASA Tech Briefs (ISSN 0145-319X); 10; 4; P. 118
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