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  • 1
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    Extreme-UV and far-UV observations of the white dwarf HZ 43 from Voyager 2 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 242
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    New NASA SEE LEO Spacecraft Charging Design Guidelines: How to Survive in LEO Rather than GEO (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: It has been almost two solar cycles since the GEO Guidelines of Purvis et al (1984) were published. In that time, interest in high voltage LEO systems has increased. The correct and conventional wisdom has been that LEO conditions are sufficiently different from GEO that the GEO Guidelines (and other GEO and POLAR documents produced since then) should not be used for LEO spacecraft. Because of significant recent GEO spacecraft failures that have been shown in ground testing to be likely to also occur on LEO spacecraft, the SEE program commissioned the production of the new LEO Spacecraft Charging Design Guidelines (hereafter referred to as the LEO Guidelines). Now available in CD-ROM form, the LEO Guidelines highlight mitigation techniques to prevent spacecraft arcing on LEO solar arrays and other systems. We compare and contrast the mitigation techniques for LEO and GEO in this paper. We also discuss the extensive bibliography included in the LEO Guidelines, so results can be found in their primary sources.
    Keywords: Spacecraft Design, Testing and Performance
    Type: 8th Spacecraft Charging Technology Conference; NASA/CP-2004-213091
    Format: application/pdf
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  • 3
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    Low-resolution Mg II h and k observations of solar type stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Observations with the International Ultraviolet Explorer (IUE) have made possible a comparison between chromospheric radiative loss rates in the Mg II h and k lines and the Ca II H and K lines. Observations made by Stencel et al. (1980) confirm the findings of Linsky et al. (1979) that the chromospheric radiative loss rates in h and k and H and K are about equal for supergiants, but the h and k loss rate is greater than the H and K loss rate in giants. It is pointed out that this may result from physical differences between the lower chromospheres of giants and supergiants. The present investigation has the objective to explore the possibility of determining relative chromospheric radiative loss rates in F and G dwarf stars with low-resolution IUE spectra. It is found that this is possible. Cluster stars were selected to provide two temperature sequences at two slightly different metal abundances.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 261
    Format: text
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  • 4
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    Voyager absolute far-ultraviolet spectrophotometry of hot stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Voyager observations in the 912-1200 A spectral region are used to indirectly intercompare absolute stellar spectrophotometry from previous experiments. Measurements of hot stars obtained by the Voyager 1 and 2 ultraviolet spectrometers show considerably higher 912-1200 A continuum fluxes than the recent observations of Brune et al. (1979) and Carruthers et al. (1981). The intercomparisons show all observations in basic agreement near 1200 A. The Carruthers et al. flux measurements are preferred down to 1050 A at which point the Voyager and Brune et al. values are respectively 60% higher and 60% lower. Below 1050 A the diasgreement among the observations becomes very large and the fluxes predicted by model atmospheres have been adopted. The pure hydrogen line-blanketed model atmosphere calculations of Wesemael et al. 1980) in comparison with Voyager observations of HZ 43 are used to adjust the Voyager calibration below 1050 A. This adjusted Voyager calibration, which is in good agreement with current model atmosphere fluxes for both early-type stars and DA white dwarfs, will be used for Voyager astronomical observations.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; vol. 257
    Format: text
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  • 5
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    An Integrated Approach to Thermal Management of International Space Station Logistics Flights, Improving the Efficiency (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The efficiency of re-useable aerospace systems requires a focus on the total operations process rather than just orbital performance. For the Multi-Purpose Logistics Module this activity included special attention to terrestrial conditions both pre-launch and post-landing and how they inter-relate to the mission profile. Several of the efficiencies implemented for the MPLM Mission Engineering were NASA firsts and all served to improve the overall operations activities. This paper will provide an explanation of how various issues were addressed and the resulting solutions. Topics range from statistical analysis of over 30 years of atmospheric data at the launch and landing site to a new approach for operations with the Shuttle Carrier Aircraft. In each situation the goal was to "tune" the thermal management of the overall flight system for minimizing requirement risk while optimizing power and energy performance.
    Keywords: Spacecraft Design, Testing and Performance
    Type: 33rd International Conference on Environmental Systems; Jul 07, 2003 - Jul 10, 2003; Vancouver, British Columbia; Canada
    Format: text
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  • 6
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    New NASA SEE LEO Spacecraft Charging Design Guidelines: How to Survive in LEO Rather Than GEO (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: It has been almost two solar cycles since the 1984 GEO Guidelines of Purvis, Garrett, Whittlesey, and Stevens were published. In that time, interest in high voltage LEO systems has increased. Correct and conventional wisdom has been that LEO conditions are sufficiently different from GEO that the GEO Guidelines (and other GEO and POLAR documents produced since then) should not be used for LEO spacecraft. Because of significant recent GEO spacecraft failures that have been shown in ground testing to be likely to also occur on LEO spacecraft, the SEE program commissioned the production of the new LEO Spacecraft Charging Design Guidelines. Now available in CD-ROM form, the LEO Guidelines highlight mitigation techniques to prevent spacecraft arcing on LEO solar arrays and other systems. We compare and contrast the mitigation techniques for LEO and GEO in this paper. We also discuss the extensive bibliography included in the LEO Guidelines, so results can be found in their primary sources.
    Keywords: Spacecraft Design, Testing and Performance
    Type: NASA/TM-2003-212737 , E-14262 , Eigth Spacecraft Charging Technology Conference; Oct 20, 2003 - Oct 24, 2003; Huntsville, AL; United States
    Format: application/pdf
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  • 7
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    NASA's New Orbital Space Plane: A Bridge to the Future (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA is developing a new spacecraft system called the Orbital Space Plane (OSP). The OSP will be launched on an expendable launch vehicle and serve to augment the shuttle in support of the International Space Station by transporting astronauts to and from the International Space Station and by providing a crew rescue system.
    Keywords: Spacecraft Design, Testing and Performance
    Type: AIAA 10th Anniverary of Flight; Jul 14, 2003 - Jul 17, 2003; Dayton, OH; United States
    Format: application/pdf
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