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  • Other Sources  (31)
  • ASTROPHYSICS  (11)
  • SPACE RADIATION  (8)
  • FABRICATION TECHNOLOGY  (7)
  • COMMUNICATIONS AND RADAR  (5)
  • 1
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    Diffusive electron acceleration at SNR shock fronts and the observed SNR radio spectral indices (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The radio synchrotron emission from relativistic electrons in shell supernova remnants (SNRs) provides a unique opportunity to probe the energy distribution of energetic electrons at their acceleration site (SNR shock fronts). This information provides insight into the acceleration mechanism(s). The implications of these observations for the diffusive (first-order Fermi) acceleration of electrons at the SNR shock fronts are discussed.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Nineteenth International Cosmic Ray Conference. Conference Papers: Invited Rapporteur, Highlight, Miscellaneous, Volume 9; 4 p
    Format: application/pdf
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  • 2
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    SAW based systems for mobile communications satellites (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Modern mobile communications satellites, such as INMARSAT 3, EMS, and ARTEMIS, use advanced onboard processing to make efficient use of the available L-band spectrum. In all of these cases, high performance surface acoustic wave (SAW) devices are used. SAW filters can provide high selectivity (100-200 kHz transition widths), combined with flat amplitude and linear phase characteristics; their simple construction and radiation hardness also makes them especially suitable for space applications. An overview of the architectures used in the above systems, describing the technologies employed, and the use of bandwidth switchable SAW filtering (BSSF) is given. The tradeoffs to be considered when specifying a SAW based system are analyzed, using both theoretical and experimental data. Empirical rules for estimating SAW filter performance are given. Achievable performance is illustrated using data from the INMARSAT 3 engineering model (EM) processors.
    Keywords: COMMUNICATIONS AND RADAR
    Type: JPL, Proceedings of the Third International Mobile Satellite Conference (IMSC 1993); p 53-58
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  • 3
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    Acoustic Levitation System (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Dense materials, such as steel balls, continuously levitated with energy provided by efficient high-powered siren in combination with shaped reflector. Reflector system, consisting of curved top reflector and flat lower reflector, eliminates instability in spatial positioning of sample.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-16146 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 570
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  • 4
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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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  • 5
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    Hollow-Sphere Production Line (1983)
    In:  Other Sources
    Details
    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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  • 6
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    Coupled hydromagnetic wave excitation and ion acceleration at interplanetary traveling shocks (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A theory for the self-consistent configuration of upstream hydromagnetic waves, upstream energetic storm particle (ESP) events, and downstream postshock ion enhancements at interplanetary traveling shocks is presented. The observations of upstream ultralow frequency waves and those ESP events and postshock enhancements which exhibit approximately isotropic ion distributions in the solar wind or shock frame are briefly reviewed. The theory of Lee (1982) for application to interplanetary traveling shocks is modified and analytical solutions for the wave spectrum as a function of wavenumber and z are presented along with the ion omnidirectional distribution functions as functions of energy and z for all ion species. The theory quantitatively explaines the observed features of the shock-associted energetic ions and predicts the configuration of upstream hydromagnetic waves.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; Aug. 1
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  • 7
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    On the anomalous component (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The so-called anomalous cosmic ray component, which occurs at energies of about 10 MeV/nucleon and consists only of He, N, O, and Ne, has been a subject of interest for more than a decade. The origin of this component is generally considered to be interstellar neutral gas that is ionized and accelerated in the solar wind. The mechanism and the location for the acceleration, however, remains an unsolved problem. A model is used which includes the effects of gradient and curvature drifts and considers the implications of observed spatial gradients of the anomalous component for the location of the acceleration region. It is concluded that if drifts are important the acceleration region cannot lie at the solar poles. It is also concluded that there is no single region for the acceleration which can account for both the observed intensities and gradients in models which include drift effects.
    Keywords: SPACE RADIATION
    Type: SH-4.6-6 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 180-183; NASA-CP-2376-VOL-5
    Format: application/pdf
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  • 8
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    Momentum-dependent diffusive particle acceleration in modified shock fronts (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In the presently derived analytic solutions of the steady transport equation for diffusive particle acceleration in a modified, planar shock front having free escape boundaries, the fluid velocity profile through the shock transition decreases monotonically between the upstream and downstream boundaries. The spatial diffusion coefficient's spatial dependence is linked to that of the fluid velocity profile. Attention is given to the solution corresponding to monoenergetic particle injection at the shock front, with free particle escape at finite distances both upstream and downstream of the shock. The accelerated particle spectrum is dominated at high energies by an exponential cutoff, due to the competition between acceleration by the first-order Fermi mechanism and particle loss through the free escape boundaries.
    Keywords: ASTROPHYSICS
    Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 215; 341-352
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  • 9
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    Particle acceleration and MHD wave excitation upstream of interplanetary shocks (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The theory of diffusive shock acceleration and its application in interplanetary space are reviewed. Special emphasis is placed on the distinction between diffusive and shock-drift shock acceleration, on ion-excitation of MHD waves upstream of the shock and the resulting self-consistent configuration of waves and accelerated ions, and on the mathematical theory of that configuration at quasi-parallel supercritical interplanetary travelling shocks. A comparison of predicted and observed proton anisotropies for the 12 November 1978 event is presented.
    Keywords: ASTROPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 4; 2-3
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  • 10
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    A simple model for the formation of 'reflected', 'intermediate', and 'diffuse' ion distributions upstream of earth's bow shock (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Detailed energetic ion and low-frequency wave experiments on ISEE 1, 2, and 3, have established correlations between the types of ion populations and waves observed to exist in the earth's foreshock region. The present calculation has the objective to quantitatively test the picture obtained for the earth's foreshock region. An analysis is conducted of the coupled spatial and temporal evolution of upstream protons and hydromagnetic waves by means of a simple model in which the protons are represented by counterstreaming beams which resonate with hydromagnetic waves, exciting the outward propagating modes and damping the inward propagating modes at a single wave number.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 39-45
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