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  • Other Sources  (22)
  • 1975-1979  (22)
  • 1
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    Prediction of energetic particle disturbances (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The prediction of fluxes of energetic particles of solar or magnetospheric origin is addressed. Topics include the prediction of the properties of the particle populations generated by magnetospheric storms and substorms, and the prediction of long term variations in the populations of magnetospheric particles.
    Keywords: SPACE RADIATION
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 415-432
    Format: text
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  • 2
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    Effect of fuel/air nonuniformity on nitric oxide emissions (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A flame tube combustor holding jet A fuel was used in experiments performed at a pressure of .3 Mpa and a reference velocity of 25 meters/second for three inlet air temperatures of 600, 700, and 800 K. The gas sample measurements were taken at locations 18 cm and 48 cm downstream of the perforated plate flameholder. Nonuniform fuel/air profiles were produced using a fuel injector by separately fueling the inner five fuel tubes and the outer ring of twelve fuel tubes. Six fuel/air profiles were produced for nominal overall equivalence ratios of .5 and .6. An example of three of three of these profiles and their resultant nitric oxide NOx emissions are presented. The uniform fuel/air profile cases produced uniform and relatively low profile levels. When the profiles were either center-peaked or edge-peaked, the overall mass-weighted nitric oxide levels increased.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Premixed Prevaporized Combustor Technol. Forum; p 131-134
    Format: application/pdf
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  • 3
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    Core compressor exit stage study. 1: Aerodynamic and mechanical design (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effect of aspect ratio on the performance of core compressor exit stages was demonstrated using two three stage, highly loaded, core compressors. Aspect ratio was identified as having a strong influence on compressors endwall loss. Both compressors simulated the last three stages of an advanced eight stage core compressor and were designed with the same 0.915 hub/tip ratio, 4.30 kg/sec (9.47 1bm/sec) inlet corrected flow, and 167 m/sec (547 ft/sec) corrected mean wheel speed. The first compressor had an aspect ratio of 0.81 and an overall pressure ratio of 1.357 at a design adiabatic efficiency of 88.3% with an average diffusion factor or 0.529. The aspect ratio of the second compressor was 1.22 with an overall pressure ratio of 1.324 at a design adiabatic efficiency of 88.7% with an average diffusion factor of 0.491.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-159714 , PWA-5561-55
    Format: application/pdf
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  • 4
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    Ion cyclotron wave growth calculated from satellite observations of the proton ring current during storm recovery (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; May 1
    Format: text
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  • 5
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    The storm and poststorm evolution of energetic /35-560 keV/ radiation belt electron distributions (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Detailed Explorer 45 equatorial observations of the storm and poststorm structure of radiation-belt electrons (35 to 560 keV) for L values between 1.7 and 5.2 are presented. Injection during major storms results in electron pitch-angle distributions and radial profiles that are greatly distorted from their quiet-time equilibrium structure. Following storms, the pitch-angle distributions return to their prestorm shape over a period of several days. This shape is maintained as electron fluxes decay back to the quiet-time levels. The equatorial radial profiles slowly return to their prestorm equilibrium structure over a period of a few weeks and then maintain that structure.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 80; Oct. 1
    Format: text
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  • 6
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    Use of LANDSAT data in monitoring patterns of aerosol pollutants and mesometeorological events (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10256 , NASA-CR-146628
    Format: application/pdf
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  • 7
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    The dominant mode of standing Alfven waves at the synchronous orbit (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Low-frequency oscillations of the earth's magnetic field recorded by a magnetometer on board ATS 1 have been examined for the 6-month interval between January and June 1968. Using evidence from OGO 5 and ATS 5 as well as the data from ATS 1, it is argued that the dominant mode at ATS 1 must be the fundamental rather than the second harmonic of a standing Alfven wave. It is concluded that these transverse oscillations are more accurately associated with magnetically disturbed days than with quiet days. From 14 instances when oscillations of distinctly different periods occurred during the same time interval at ATS 1, it is also concluded that higher harmonics can exist. The period ratio in seven of the 14 cases corresponds to the simultaneous occurrence of the second harmonic with the fundamental, and four other cases could be identified as the simultaneous occurrence of the fourth harmonic with the fundamental.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Sept. 1
    Format: text
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  • 8
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    The quiet time structure of energetic /35-560 keV/ radiation belt electrons (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Detailed Explorer 45 observations of quiet time pitch angle distributions and equatorial radial profiles of energetic radiation belt electrons are presented. The observed pitch angle distributions in the slot region and the outer regions of the plasmasphere are found to agree with the values expected from resonant interactions with the plasmaspheric whistler mode wave band, and Coulomb collisions are found to be the dominant electron loss mechanism in the inner zone. The overall structure of quiet time radial profiles is shown to agree with the equilibrium structure expected to result from a balance between pitch angle scattering losses and radial diffusion from an outer zone source, and this agreement suggests that the dominant quiet time source and loss mechanisms have been correctly identified. Electron fluxes in the inner plasmasphere are found to remain nearly constant during the quiet periods due to their decoupling from magnetic activity variations in the outer plasmasphere.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 80; Mar. 1
    Format: text
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  • 9
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    An alternative analysis of low- and high-altitude observations of ring current ions during a storm recovery phase (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Explorer 45 equatorial observations of ring current ions during a storm recovery phase have shown pitch angle distributions and decay rates inconsistent with proton charge exchange with neutral hydrogen. This inconsistency has led to the suggestion that recovery phase ring current ions at L less than or equal to 4 and energies not greater than 50 keV are dominated by He(+) rather than protons. The absence of He(+) on flux tubes from which H(+) and O(+) were precipitating in ion mass spectrometer measurements made during the same period by the low-altitude polar-orbiting satellite 1971-089A led Sharp et al. to suggest a source of H(+) and O(+) to L = 3 during this period. An alternative explanation, in which the magnetic field lines labeled L = 3 at the earth's surface near local midnight were mapped to about 3.7 earth radii in the equatorial plane during the storm recovery phase and during the period of enhanced activity, is proposed. If the proposed explanation is correct, the observations of Sharp et al. are not incompatible with the conclusion that the recovery phase ions at less than 50 keV were dominated by He(+) for L not greater than 3.7.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; June 1
    Format: text
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  • 10
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    Adiabatic evolution of trapped particle pitch angle distributions during a storm main phase (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Equatorial pitch angle distributions of over 200-keV ions obtained near L = 4 by Explorer 45 during a storm main phase show the development of marked minima at 90 deg pitch angle in direct association with a greater-than-a-factor-of-2 reduction in the equatorial magnetic field magnitude. The evolution of these pitch angle distributions can be quantitatively explained as a result of conservation of the first two adiabatic invariants provided the magnitude of the magnetic field decrease was approximately constant along field lines.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; June 1
    Format: text
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