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  • ENERGY PRODUCTION AND CONVERSION  (92)
  • SOLAR PHYSICS  (45)
  • 1980-1984
  • 1975-1979  (137)
  • 1979  (137)
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  • 1980-1984
  • 1975-1979  (137)
Year
  • 1
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    Radiation transfer through a model sunspot (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A cylindrically symmetric model for a sunspot atmosphere using the similarity principle of Schlueter and Temesvary for the magnetic field configuration is presented. The equations of magnetostatic equilibrium are used, augmented by a radial Evershed flow. The LTE radiative transfer equations for the Stokes vector were solved under a variety of conditions for a ray emerging from a typical penumbral point. The contribution from isolated lines to the broadband circular polarization in sunspot penumbrae is evaluated using a more realistic model sunspot atmosphere than has hitherto been considered. Results indicate that the inclusion of a velocity field along the magnetic field vector is unable to give a net circular polarization of sufficient magnitude, although the variation with the angle between the line-of-sight and the magnetic field vector is in qualitative agreement with observations. The corresponding results for the net linear polarization are satisfactory.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 63; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Evaluation of feasibility of prestressed concrete for use in wind turbine blades (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A preliminary evaluation of the feasibility of the use of prestressed concrete as a material for low cost blades for wind turbines was conducted. A baseline blade design was achieved for an experimental wind turbine that met aerodynamic and structural requirements. Significant cost reductions were indicated for volume production. Casting of a model blade section showed no fabrication problems. Coupled dynamic analysis revealed that adverse rotor tower interactions can be significant with heavy rotor blades.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-159725 , DOE/NASA/5906-79/1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    International photovoltaic program. Volume 2: Appendices (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The results of analyses conducted in preparation of an international photovoltaic marketing plan are summarized. Included are compilations of relevant statutes and existing Federal programs; strategies designed to expand the use of photovoltaics abroad; information on the domestic photovoltaic plan and its impact on the proposed international plan; perspectives on foreign competition; industry views on the international photovoltaic market and ideas about the how US government actions could affect this market;international financing issues; and information on issues affecting foreign policy and developing countries.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163339
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Stochastic acceleration of solar flare protons (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The acceleration of solar flare protons by the cyclotron damping of intense Alfven wave turbulence in a magnetic trap is considered. The energy diffusion coefficient is computed for a near-isotropic distribution of super-Alfvenic protons, and a steady-state solution for the particle spectrum is found for both transit-time and diffusive losses out of the ends of the trap. The acceleration time to a characteristic energy of about 20 MeV per nucleon can be as short as 10 sec. On the basis of phenomenological arguments, it is inferred that the Alfven wave spectrum typically has an inverse square frequency dependence and that the correlation time of the turbulence lies in the range between 0.5 and 50 msec.
    Keywords: SOLAR PHYSICS
    Type: AD-A081336 , Astrophysical Journal; vol. 233
    Format: text
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  • 5
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    Dynamo action in a thin slab (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We consider the dynamo action produced by convection of a partially ionized, electrically conducting gas in a magnetic field. The model consists of two thin, Cartesian unipolar inductors connected in series by the magnetic field. For the case of a uniform magnetic field we compute the total current system generated by an arbitrary gas flow; for the case of a nonuniform field, we compute only the field-aligned coupling current. Application is made to the solar atmosphere.
    Keywords: SOLAR PHYSICS
    Type: AD-A069773 , Astrophysical Journal; vol. 228
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  • 6
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    Plasma radiation diagnostics of the primary energy release region in solar flares (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The possibility is investigated that the plasma turbulence used in many recent models of the primary energy release and acceleration in solar flares should be detectable by radiation near the fundamental and second harmonic of the plasma frequency. Formulae are derived for fundamental emission due to the combination of ion-acoustic and Langmuir plasma turbulence and for second harmonic emission due to the combination of two Langmuir waves. These results are applied to recent primary energy release and acceleration models which shows that either such radiation should be detectable and possibly distinguishable with suitable microwave interferometers or that its absence places fairly stringent constraints on the possible level of Langmuir or Langmuir and ion-acoustic waves in these models.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 62; June 197
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  • 7
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    CO emission lines in the solar atmosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: New identifications of CO emission lines in the EUV spectrum of a sunspot are reported. The spectra were obtained with the Naval Research Laboratory's High Resolution Telescope and Spectrograph. The emission is from the CO fourth positive system and is excited by the strong lines of C IV, Si IV and O IV. Transitions in the 0-3 band which lie above 1700 A and other lines at shorter wavelengths have been identified from the spectrum of the June 15, 1973 flare, obtained with the Naval Research Laboratory's normal incidence spectrograph on Skylab. The observed intensities in the sunspot are used to derive the CO column density.
    Keywords: SOLAR PHYSICS
    Type: Royal Astronomical Society; vol. 187
    Format: text
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  • 8
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    H2 emission in the solar atmosphere (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: New identifications of emission lines of molecular hydrogen in the EUV spectrum of sunspots are reported. The spectra were obtained during the first and second flights of the Naval Research Laboratory's High Resolution Telescope and Spectrograph (HRTS). While most of the lines originate in the Lyman bands, fluorescence from the Werner bands has been found for the first time in the solar atmosphere. H2 fluorescent emission has also been identified in the spectra of a solar flare observed with NRL's normal incidence spectrograph on Skylab. Column densities for H2 are derived from intensities of lines in the sunspot spectra.
    Keywords: SOLAR PHYSICS
    Type: Royal Astronomical Society; vol. 187
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  • 9
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    Measurement Techniques and Instruments Suitable for Life-prediction Testing of Photovoltaic Arrays (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The validation of a 20-year service life for low-cost photovoltaic arrays is a critical requirement in the Low-Cost Solar Array (LSA) Project. The validation is accomplished through accelerated life-prediction tests. A two-phase study was conducted to address the needs before such tests are carried out. The results and recommended techniques from the Phase 1 investigation are summarized in the appendix. Phase 2 of the study is covered in this report and consisted of experimental evaluations of three techniques selected from these recommended as a results of the Phase 1 findings. The three techniques evaluated were specular and nonspecular optical reflectometry, chemiluminescence measurements, and electric current noise measurements.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-158733 , DOE/JPL-954328-79/12
    Format: application/pdf
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  • 10
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    Dedicated nuclear facilities for electrolytic hydrogen production (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An advanced technology, fully dedicated nuclear-electrolytic hydrogen production facility is presented. This plant will produce hydrogen and oxygen only and no electrical power will be generated for off-plant use. The conceptual design was based on hydrogen production to fill a pipeline at 1000 psi and a 3000 MW nuclear base, and the base-line facility nuclear-to-shaftpower and shaftpower-to-electricity subsystems, the water treatment subsystem, electricity-to-hydrogen subsystem, hydrogen compression, efficiency, and hydrogen production cost are discussed. The final conceptual design integrates a 3000 MWth high-temperature gas-cooled reactor operating at 980 C helium reactor-out temperature, direct dc electricity generation via acyclic generators, and high-current density, high-pressure electrolyzers based on the solid polymer electrolyte approach. All subsystems are close-coupled and optimally interfaced and pipeline hydrogen is produced at 1000 psi. Hydrogen costs were about half of the conventional nuclear electrolysis process.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Hydrogen for energy distribution; Symposium; Jul 24, 1978 - Jul 28, 1978; Chicago, IL
    Format: text
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