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  • 1
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    Concentrations and isotope ratios of carbon, nitrogen and sulfur in ocean-floor basalts (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ocean floor basalts studied from the Galapagos Ridge, FAMOUS area, Cayman Trough and Kilauea east rift contain 20-200 ppm carbon and 0.3-2.8 ppn nitrogen as sums of the vesicle-filling gases CO2 and N2 and dissolved species. The wide range of carbon contents found is due partly to the different extent of outgassing of vesicle-filling gases and partly to depth dependency of dissolved CO2 in the basalts. Sulfate commonly exists with sulfide in these basalts, and the sulfate/sulfide ratio increases with increasing water content, perhaps reflecting the higher oxidation potential in basalt melt of the higher water content.
    Keywords: GEOPHYSICS
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 48; 2433-244
    Format: text
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  • 2
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    Carbon and its isotopes in mid-oceanic basaltic glasses (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Sample surface carbon, mantle carbon dioxide in vesicles, and mantle carbon dissolved in glasses, are the three carbon components evident in the 11 mid-oceanic basalts presently analyzed. The total carbon content may be controlled by the depth of the shallowest ridge magma chamber, and carbon isotopic fractionation accompanies magma degassing. Using He-3 and carbon data for submarine hydrothermal fluids, the present day midoceanic ridge carbon flux is approximately estimated to be 1.0 x 10 to the 13th g C/yr, requiring 8 Gyr to accumulate the earth's present crustal carbon inventory.
    Keywords: GEOPHYSICS
    Type: Earth and Planetary Science Letters (ISSN 0012-821X); 69; 1, Ju; 43-57
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  • 3
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    F layer ionization patches in the polar cap (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ground-based optical and digital ionosonde measurements were conducted at Thule, Greenland to measure ionospheric structure and dynamics in the nighttime polar cap F layer. These observations showed the existence of large-scale (800-1000 km) plasma patches drifting in the antisunward direction during a moderately disturbed (Kp greater than or equal to 4) period. Simultaneous Dynamics Explorer (DE-B) low-altitude plasma instrument (LAPI) measurements show that these patches with peak densities of about 10 to the 6th el per cu cm are not locally produced by structured particle precipitation. The LAPI measurements show a uniform precipitation of polar rain electrons over the polar cap. The combined measurements provide a comprehensive description of patch structure and dynamics. They are produced near or equatorward of the dayside auroral zone and convect across the polar cap in the antisunward direction. Gradients within the large scale, drifting patches are subject to structuring by convective instabilities. UHF scintillation and spaced receiver measurements are used to map the resulting irregularity distribution within the patches.
    Keywords: GEOPHYSICS
    Type: AD-A140133 , AFGL-TR-84-0113 , Journal of Geophysical Research (ISSN 0148-0227); 89; 1683-169
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  • 4
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    Polarimetry of the daytime sky during solar eclipses. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurement of the degree of linear polarization of the residual illumination in the umbral region in different colors at intermediate levels in the atmosphere (10 to 12 km) during the total solar eclipses of May 30, 1965, and Nov. 12, 1966. The objective was to examine the polarization characteristics of light that had been scattered more than once. It is found that, in the middle of the visible region of the electromagnetic spectrum (0.4 to 0.6 micron), multiply scattered light is partially linearly polarized (about 20%) at the altitudes where the measurements have been made. Results of similar ground-based measurements performed during the annular eclipse of Sept. 11, 1969, are also briefly discussed.
    Keywords: GEOPHYSICS
    Type: AD-752766 , AFCRL-72-0702 , Journal of Atmospheric and Terrestrial Physics; 34; Apr. 197
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  • 5
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    Rocket measurement of the secondary electron spectrum in an aurora (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Differential secondary electron flux measurement in aurora with Aerobee rocket spectrometer
    Keywords: GEOPHYSICS
    Type: ; BROTECHNIKA, NO. 1(
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  • 6
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    Rocket measurement of the secondary electron spectrum in an aurora (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Secondary electron emission measurement in aurora using Aerobee rocket vehicle
    Keywords: GEOPHYSICS
    Type: NASA-CR-116858 , TR-26
    Format: application/pdf
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  • 7
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    Coordinated airborne and satellite measurements of equatorial plasma depletions (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A series of experiments conducted in December 1979 to investigate the structure of plasma depletions in the low latitude, nighttime ionosphere is discussed. Density biteouts of about one order of magnitude in the dominant ion, O(+), are mapped to lower altitudes along magnetic field lines for comparison with 6300-A and 7774-A O I airglow depletions. Owing to the different airglow production mechanisms (dissociative recombination of O2(+) for 6300 A and radiative recombination of O(+) for 7774 A), the 6300-A depletions reflect plasma depletions near the bottomside of the F layer, while those at 7774 A are located near the peak of the layer. The O(+) biteouts map directly into the 7774-A airglow depletions in the same hemisphere and also when traced into the opposite hemisphere, which suggests magnetic flux tube alignment over north-south distances of approximately 2220 km. The 6300-A (bottomside) depletions are found to be wider in longitude than the 7774-A (F-peak) depeletions near the equatorward edge of the Appleton anomaly.
    Keywords: GEOPHYSICS
    Type: AD-A123689 , AFGL-TR-83-0004 , Journal of Geophysical Research; 87; Dec. 1
    Format: text
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