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  • SOLAR PHYSICS  (8)
  • FABRICATION TECHNOLOGY  (4)
  • SPACE RADIATION
  • 1990-1994  (2)
  • 1980-1984  (11)
  • 1
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    The association of energetic particles and shocks in the heliosphere (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The observational and theoretical work on heliospheric shocks and cosmic rays in the recent past is surveyed. The data have come mainly from spacecraft in the regions from 0.3-25 AU, and include detection of particles and plasma waves upstream of the earth's bow shock. The theory of shock acceleration is reviewed, together with analytical models of energetic particle enhancement in association with shocks or shocks within the heliosphere. It has been determined that shocks in the heliosphere are associated with energetic suprathermal particles, which are conversely all associated with shocks. Solar cosmic rays and other anomalous components are therefore accelerated by shocks, a factor that is significant for studies of the acceleration mechanisms for galactic cosmic rays. The Solar Polar Mission will provide data on all solar latitudes, and the ISEE-3 spacecraft will continue to gather information on shock accelerated ions in travelling interplanetary shock waves.
    Keywords: SOLAR PHYSICS
    Type: (ISSN 0034-6853)
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    NASA TECHNICAL REPORTS
  • 2
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    Producing Metallic Glasses With Acoustic Leviation (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Acoustic fields support and cool liquid particles. Levitated by sound energy, liquid drop in acoustic standing-wave field surrounded by acousticically-induced jet streams. Streaming gas cools drow below its freezing point in small fraction of second. Allows new amorphous alloys including "metallic glass" to be formed.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15658 , NASA Tech Briefs (ISSN 0145-319X); 7; 4; P. 472
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    NASA TECHNICAL REPORTS
  • 3
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    Hollow-Sphere Production Line (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: After initial formation, spheroids processed without contaminating touch of solid objects. Spheroid in process supported by acoustic levitation at each work station and transported between stations by combination of acoustic levritation and acoustic propulsion. Automatic sequence of target-pellet fabication allows no contact of solid ojbect with spheroids in process. Potential for manufacture of precise microcapsules for catalysts and medications.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15592 , NASA Tech Briefs (ISSN 0145-319X); 7; 4; P. 471
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    NASA TECHNICAL REPORTS
  • 4
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    The role of particle drifts in solar modulation (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The work of Isenberg and Jokipii (1979) is examined and it is shown that their extension of the conventional drift-flux formula to static magnetic fields of arbitrary spatial variation is invalid for interplanetary cosmic-ray transport. A field configuration involving helical magnetic fields which suppresses curvature and gradient drift and which may occur in the solar wind is presented. It is concluded that the conventional drift-flux contribution to the solar modulation of cosmic rays may, but need not, be important.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 248
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  • 5
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    Shock acceleration of energetic particles in corotating interaction regions in the solar wind (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A simple shock model for the acceleration of energetic particles in corotating interaction regions (CIRs) in the solar wind is presented. Particles are accelerated at the forward and reverse shocks which bound the CIR by being compressed between the shock fronts and magnetic irregularities upstream from the shocks, or by being compressed between upstream irregularities and those downstream from the shocks. Particles also suffer adiabatic deceleration in the expanding solar wind, an effect not included in previous shock models for acceleration in CIRs. The model is able to account for the observed exponential spectra at earth, the observed behavior of the spectra with radial distance, the observed radial gradients in the intensity, and the observed differences in the intensity and spectra at the forward and reverse shocks.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 237
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  • 6
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    Comments on the dissipation of hydromagnetic surface waves (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A recent paper by Wentzel, which claims to calculate a plasma heating rate due to dissipation of surface waves in an ideal magnetohydrodynamic (MHD) fluid, is found to be in error in interpretation. A well-established general theorem pertaining to the conservative ideal MHD fluid requires that the normal mode calculated by Wentzel be oscillatory in time. Within ideal MHD, dissipation and plasma heating are therefore impossible.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 240
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  • 7
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    Sound Waves Levitate Substrates (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: System recently tested uses acoustic waves to levitate liquid drops, millimeter-sized glass microballoons, and other objects for coating by vapor deposition or capillary attraction. Cylindrical contactless coating/handling facility employs a cylindrical acoustic focusing radiator and a tapered reflector to generate a specially-shaped standing wave pattern. Article to be processed is captured by the acoustic force field under the reflector and moves as reflector is moved to different work stations.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15435 , NASA Tech Briefs (ISSN 0145-319X); 6; 2; P. 217
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  • 8
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    Temporal development of diffuse ion events upstream of the earth's bow shock - The October 31, 1977, event (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The origin of the intensity-time profile characteristic of diffuse ion events upstream of the earth's bow shock is investigated. It is believed that the profile results from a rotation of the interplanetary magnetic field that produces as a systematic variation in the connection time of field lines with the bow shock. If the connection time exceeds the time needed to reach equilibrium between the shock acceleration and ion loss processes, a plateau in the ion intensity is formed. The upstream diffusion ion event of October 31, 1977, for which simultaneous magnetic field and ion intensity data have been published is used to test this scenario. This event is analyzed using a two-dimensional Gleeson-Axford equation to describe the shock acceleration process and a model bow shock whose nose serves as a uniform source of ions injected into the acceleration process. Intensity-time profiles are calculated for 30-keV and 120-keV protons for a range of diffusion coefficients using connection times that are based on the shock geometry and the magnetic field data.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; 9975-998
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  • 9
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    Solar particle propagation and modulation theory (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Developments related to solar flare particle propagation theory are considered, taking into account the transport equation currently employed to describe the propagation of solar flare particles. This equation does not take into consideration convection with the solar wind, drifts, and changes in particle energy. The equation was solved numerically to generate typical solar flare particle time profiles at 1 AU. The results, however, were not satisfactory. It was found that the numerical method used was apparently in error. New advances which provide approximate analytical solutions to the equation are reported. Questions of galactic cosmic ray propagation in interplanetary space are also discussed.
    Keywords: SOLAR PHYSICS
    Type: International Cosmic Ray Conference; Jul 13, 1981 - Jul 25, 1981; Paris; France
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  • 10
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    Acoustic-Levitation Chamber (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Uncontaminated environments for highly-pure material processing provided within completely sealed levitation chamber that suspends particles by acoustic excitation. Technique ideally suited for material processing in low gravity environment of space.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-16142 , NASA Tech Briefs (ISSN 0145-319X); 8; 2; P. 291
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