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  • Solar Physics  (14)
  • Aircraft Design, Testing and Performance  (11)
  • SPACECRAFT PROPULSION AND POWER  (9)
  • Astronomy  (8)
  • 1
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    Space station electrical power system (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this paper is to describe the design of the Space Station Electrical Power System. This includes the Photovoltaic and Solar Dynamic Power Modules as well as the Power Management and Distribution System (PMAD). In addition, two programmatic options for developing the Electrical Power System will be presented. One approach is defined as the Enhanced Configuration and represents the results of the Phase B studies conducted by the NASA Lewis Research Center over the last two years. Another option, the Phased Program, represents a more measured approach to reaching about the same capability as the Enhanced Configuration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-100140 , E-3692 , NAS 1.15:100140 , IAF-87-234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Seismic Constraints on Interior Solar Convection (2010)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: We constrain the velocity spectral distribution of global-scale solar convective cells at depth using techniques of local helioseismology. We calibrate the sensitivity of helioseismic waves to large-scale convective cells in the interior by analyzing simulations of waves propagating through a velocity snapshot of global solar convection via methods of time-distance helioseismology. Applying identical analysis techniques to observations of the Sun, we are able to bound from above the magnitudes of solar convective cells as a function of spatial convective scale. We find that convection at a depth of r/R(solar) = 0.95 with spatial extent l 〈 30, where l is the spherical harmonic degree, comprise weak flow systems, on the order of 15 m/s or less. Convective features deeper than r/R(solar) = 0.95 are more difficult to image due to the rapidly decreasing sensitivity of helioseismic waves.
    Keywords: Solar Physics
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    NASA TECHNICAL REPORTS
  • 3
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    Simplified Solar Modulation Model of Inner Trapped Belt Proton Flux As a Function of Atmospheric Density (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: No simple algorithm seems to exist for calculating proton fluxes and lifetimes in the Earth's inner, trapped radiation belt throughout the solar cycle. Most models of the inner trapped belt in use depend upon AP8 which only describes the radiation environment at solar maximum and solar minimum in Cycle 20. One exception is NOAAPRO which incorporates flight data from the TIROS/NOAA polar orbiting spacecraft. The present study discloses yet another, simple formulation for approximating proton fluxes at any time in a given solar cycle, in particular between solar maximum and solar minimum. It is derived from AP8 using a regression algorithm technique from nuclear physics. From flux and its time integral fluence, one can then approximate dose rate and its time integral dose. It has already been published in this journal that the absorbed dose rate, D, in the trapped belts exhibits a power law relationship, D = A(rho)(sup -n), where A is a constant, rho is the atmospheric density, and the index n is weakly dependent upon shielding. However, that method does not work for flux and fluence. Instead, we extend this idea by showing that the power law approximation for flux J is actually bivariant in energy E as well as density rho. The resulting relation is J(E,rho)approx.(sum of)A(E(sup n))rho(sup -n), with A itself a power law in E. This provides another method for calculating approximate proton flux and lifetime at any time in the solar cycle. These in turn can be used to predict the associated dose and dose rate.
    Keywords: Solar Physics
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  • 4
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    Brayton Power Conversion System Parametric Design Modelling for Nuclear Electric Propulsion (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The parametrically based closed Brayton cycle (CBC) computer design model was developed for inclusion into the NASA LeRC overall Nuclear Electric Propulsion (NEP) end-to-end systems model. The code is intended to provide greater depth to the NEP system modeling which is required to more accurately predict the impact of specific technology on system performance. The CBC model is parametrically based to allow for conducting detailed optimization studies and to provide for easy integration into an overall optimizer driver routine. The power conversion model includes the modeling of the turbines, alternators, compressors, ducting, and heat exchangers (hot-side heat exchanger and recuperator). The code predicts performance to significant detail. The system characteristics determined include estimates of mass, efficiency, and the characteristic dimensions of the major power conversion system components. These characteristics are parametrically modeled as a function of input parameters such as the aerodynamic configuration (axial or radial), turbine inlet temperature, cycle temperature ratio, power level, lifetime, materials, and redundancy.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-191135 , NAS 1.26:191135 , REPT-93RC-010143 , E-8345
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  • 5
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    Space Station Electrical Power System (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The purpose of this paper is to describe the design of the Space Station Electrical Power System. This includes the Photovoltaic and Solar Dynamic Power Modules as well as the Power Management and Distribution System (PMAD). In addition, two programmatic options for developing the Electrical Power System will be presented. One approach is defined as the Enhanced Configuration and represents the results of the Phase B studies conducted by the NASA Lewis Research Center over the last two years. Another option, the Phased Program, represents a more measured approach to reaching about the same capability as the Enhanced Configuration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IAF PAPER 87-234
    Format: text
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  • 6
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    Change Detection Experiments Using Low Cost UAVs (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: This paper presents the progress in the development of a low-cost change-detection system. This system is being developed to provide users with the ability to use a low-cost unmanned aerial vehicle (UAV) and image processing system that can detect changes in specific fixed ground locations using video provided by an autonomous UAV. The results of field experiments conducted with the US Army at Ft. A.P.Hill are presented.
    Keywords: Aircraft Design, Testing and Performance
    Type: Infotech@Aerospace; 26-29 Sept. 2005; Arlington, VA; United States
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    NASA TECHNICAL REPORTS
  • 7
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    Design, Development, and Testing of a Compound Wing V/TOL small UAS (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: This paper discusses the development and testing of an innovative small UAS (Unmanned Aircraft System). The design of the vehicle was driven by the need to both have long endurance yet still have the convenience of V/TOL (Vertical Take-Off and Landing) operation. The paper discusses some of the design considerations and configurations evaluated in searching for a configuration that met the demanding mission requirements. The paper also discusses some aspects of the compound wing and experimental testing conducted to discern the optimum parameters for the wing's design. The paper discusses the results of the preliminary flight testing and outlines further research to be conducted.
    Keywords: Aircraft Design, Testing and Performance
    Type: NF1676L-19089 , SciTech 2015; Jan 05, 2015 - Jan 09, 2015; Kissimmee, FL; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Status of the SOFIA Observatory (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The SOFIA observatory has been in routine science operations since returning in January from a 6 month-long heavy maintenance period for the aircraft and the telescope assembly. These operations include a successful 6 week deployment to the Southern hemisphere. This presentation will provide an update to the current operational status of the SOFIA observatory, concentrating on the improvements and upgrades that have been implemented since the heavy maintenance period.
    Keywords: Astronomy
    Type: ARC-E-DAA-TN23899 , International Astronomical Union General Assembly; Aug 03, 2015 - Aug 14, 2015; Honolulu, HI; United States
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  • 9
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    Spitzer Infrared Spectrograph Observations of L, M, and T Dwarfs (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: We present here the first mid-infriared spectra of brown dwarfs, together with observations of a low-mass star. Our targets are the M3.5 dwarf GJ 1001 A, the L8 dwarf DENIS-P JO255-4700, and the T1/T6 binary system epsilon Indi Ba/Bb. As expected, the mid- infrared spectral morphology of these objects changes rapidly with spectral class due to the changes in atmospheric chemistry resulting from their differing effective temperatures and atmospheric structures. By taking advantage of the unprecedented sensitivity of the Infrared Spectrograph instrument of the Spitzer Space Telescope we have detected for the first time the 7.6 micron methane band and confirmed the presence of ammonia in a T dwarf atmosphere.
    Keywords: Astronomy
    Type: SSA-137
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  • 10
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    Advances in Time-Distance Helioseismology (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Time-distance helioseismology is a way to measure travel times between surface locations for waves traversing the solar interior. Coupling the travel with an extensive modeling effort has proven to be a powerful tool for measuring flows and other wave speed inhomogeneities in the solar interior. Problems receiving current attention include studying the time variation of the meridional circulation and torsional oscillation and active region emergence and evolution, current results on these topics will be presented.
    Keywords: Solar Physics
    Type: American Astronomical Society Meeting; Jun 02, 2002 - Jun 06, 2002; Albuquerque, NM; United States
    Format: text
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