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  • 1
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    Aircraft measurements of NO and NOy at 12 km over the Pacific Ocean (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Measurements of nitric oxide (NO) and total reactive nitrogen (NOy) at altitudes about 12 km were made from two aircraft missions over the central and western Pacific Ocean at latitudes between 65 deg N and 65 deg S during the International Strato-Tropospheric Air Chemistry (INSTAC) program. NO measurements were performed during the first mission in late February and early march 1990, while NOy measurements were performed during the second mission in October 1990. Lowest NO and NOy mixing ratios in the upper troposphere were observed near the equator to be about 30 to approximately 70pptv and 150 to approximately 220pptv, respectively. NOy mixing ratios in the upper troposphere were higher in the northern middle latitude than in the southern middle latitude; 300 to approximately 900pptv in 30 deg N to approximately 50 deg N and 250 to approximately 400pptv around 25 deg S and 50 deg S possibly due to the transport of the polluted air from the boundary layer and the emissions from the commercial aircraft in the northern middle latitudes. Near the equator up to 40 deg S, the NO values showed very high variability and reached between 200 and 2000 pptv. NOy(pptv)/ozone(ppbv) ratios in the upper troposphere were between about 3 and 20 and these values seem to be higher in the lower latitude except for the polluted air in the northern middle latitude. These NOy/ozone ratios in the equatorial upper troposphere are higher than those in the lower stratosphere observed by others. These features of NO and NOy in the equatorial upper troposphere suggest that NOx is produced possibly by the lightning.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2; p 849-853
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    On the possibility of a geocoronal contribution to the celestial soft X-ray background (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The possibility is investigated that a significant fraction of the X-ray background in the energy range from 0.2 to 0.28 keV originates in the geocorona through bremsstrahlung. It is concluded that the geocoronal flux must be substantial at some times and the possibility exists that an observable geocoronal background exists at all times. The existing data on the soft X-ray background is found to be compatible with the hypothesis of a geocoronal component.
    Keywords: SPACE RADIATION
    Type: Astrophysics and Space Science; 30; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Future ultraviolet observations from space (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Astronomical facilities to observe from space in the ultraviolet are reviewed. For the immediate future, IUE and the extreme ultraviolet spectrometers of Voyager 1 and Voyager 2 are available for furthering knowledge of cataclysmic variables. The Hubble Space telescope is scheduled for launch in 1986 and will be available to guest observers. The Far Ultraviolet Spectroscopic Explorer, which is expected to provide the capability to observe in the far and extreme ultraviolet, is planned for launch in the 1990s.
    Keywords: SPACE RADIATION
    Type: ESA Recent Results on Cataclysmic Variables; p 193-194
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  • 4
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    A search for Lyman-alpha emission in beta Lyrae from Copernicus (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-resolution (0.2 A) spectrophotometric observations of the complex eclipsing binary beta Lyrae were obtained with the Princeton Telescope Spectrometer on the Copernicus satellite. We discuss the search for L-alpha emission in beta Lyrae and compare the Copernicus results with the OAO-2 observations of the same binary system. The possible L-alpha emission features observed from OAO-2 are identified as blends of the emission lines of other elements in the vicinity of L-alpha.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 188; Mar. 1
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  • 5
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    On the physical parameters for Centaurus X-3 and Hercules X-1. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: It is shown how upper and lower limits on the physical parameters of X-ray sources in Centaurus X-3 and Hercules X-1 may be determined from a reasonably simple and straightforward consideration. The basic assumption is that component A (the non-X-ray emitting component) is not a star collapsing toward its Schwartzschild radius (i.e., a black hole). This assumption appears reasonable since component A (the radius of the central occulting star) appears to physically occult component X. If component A is a 'normal' star, both observation and theory indicate that its mass is not greater than about 60 solar masses. The possibility in which component X is either a neutron star or a white dwarf is considered.
    Keywords: SPACE RADIATION
    Type: Astrophysics and Space Science; 19; Dec. 197
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  • 6
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    In situ measurements of nitric oxide, ozone, and aerosols in the Scandinavian Arctic stratosphere in January 1992 (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: During the European Arctic Stratospheric Ozone Experiment (EASOE) the Arctic stratosphere was investigated with a set of instruments flown on a CNES high altitude balloon from ESRANGE, northern Sweden (67 deg 52 minutes N, 21 deg 4 minutes E) on January 22, 1992. The vertical profiles to an altitude of 30 km are presented for ozone, nitric oxide, aerosols, and the temperature. The ozone mixing ratio was less than 0.1 ppmv below 13 km, and increased significantly only above the 18.5 km level. The aerosol concentration profile shows a large peak between 13 km and 21 km, centered at 18.5 km, reaching as high as about 10 particles/cu cm. Above 24 km the aerosols were absent. Below 22 km, the NO mixing ratio was lower than 50 pptv; however it increased rapidly from 23 km with a sharp peak at 27 km. The rapid increase in NO occurs just at the altitude where the aerosol concentration falls below the detection limit: on this day, NO was present only in the absence of aerosols.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters (ISSN 0094-8276); 21; 13; p. 1243-1246
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