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  • GEOPHYSICS  (20)
  • OPTICS  (2)
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  • 1
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    Spectroscopy of the extreme ultraviolet dayglow during active solar conditions (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The spectral characteristics of the mid-latitude daytime airglow observed between 530 and 1500 A under conditions of high solar activity are compared with those obtained at the same location during markedly lower solar activity. The spectral observations were made by two scanning spectrometers and an N2 3371 A photometer carried aboard Astrobee-F rockets launched from White Sands Missile Range, NM, on January 9, 1978 and June 27, 1980. The more recent data allow the partial resolution of the emission spectrum between 800 and 1200 A into a large number of weak N I, O I and N2 transitions. Data taken at 220 km altitude suggest an increase in atomic nitrogen density of more than a factor of 3 between the two observations, along with a doubling of the solar EUV flux at wavelengths less than 688 A. No evidence of a corresponding increase in the 10 to 50 eV photoelectron flux is found, however, an ionospheric sounding data indicate the peak electron density to have decreased during this period. The mechanism for this electron flux decrease in the face of increased EUV flux and only a three-fold increase in N concentration remains unknown.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; Dec. 198
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  • 2
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    The ultraviolet spectrum of a dayside aurora - 530-1500 A (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Observations by rocket-borne spectrometers of the high-latitude dayside aurora above Cape Perry, N.W.T. are reported. UV spectra of optical emissions produced by ambient precipitating particles are obtained in the 530-1500 A region, over a range of spectrometer line-of-sight orientations, from 100 km to the rocket apogee of 452 km. The spectrum below 1500 A is dominated by transitions from neutral and singly ionized atomic oxygen. N I, N II, and N2 emissions, which are prominent in day airglow and nighttime auroral spectra measured by the same instrumentation, are very weak, indicating energy from the dayside auroral particles is transferred to the atmosphere above most of the N2. Relative line strengths of O I and O II transitions in the high-latitude dayside aurora differ in comparison with either airglow or nighttime auroral observations.
    Keywords: GEOPHYSICS
    Type: Canadian Journal of Physics (ISSN 0008-4204); 67; 82-88
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  • 3
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    O I (7990 A) emission and radiative entrapment of auroral EUV (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The auroral O I 7990-A multiplet intensity distribution has been observed by means of a 2-m grille spectrometer and a Fabry-Perot interferometer during 1977 and 1982, respectively, in Alaska. Grille spectrometer results indicate a nonstatistical distribution in the excited state, consistent with the preferential scattering of the O I 989-A EUV emission and in accord with recent radiative transfer calculations. A comparison of O I 7990-A intensities measured on the nightside with those from dayside magnetospheric cleft aurora shows a cascade contribution to the O I 8446-A line, and ultimately to the O I 1304-A transition, that depends on the altitude of the aurora. This is attributed to the greater radiative enhancement of O I 989-A at low altitude, and the correspondingly enhanced probability for branching from the 3 s-prime to the 3 p level in atomic O.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; June 1
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  • 4
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    Vacuum ultraviolet monochromator calibration using measured atomic branching ratios (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is noted that there now exists a compendium of experimentally measured transition probability ratios for ionized transitions of oxygen, nitrogen, and sulfur, which can be used for calibration in the VUV spectral region. The emissions proposed for use in this context span the 485-1124 A wavelength interval, and can be easily excited using low pressure discharge lamps of conventional design and dispersed using a monochromator of moderate resolution.
    Keywords: OPTICS
    Type: Applied Optics; 22; Mar. 15
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  • 5
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    High-resolution dayglow O I /1304 A/ and O I /989 A/ rocket observations (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High-resolution (about 1 A) dayglow observations of the O I(1304) A) and O I(989 A) multiplets were made from an Astrobee-F rocket payload (25.046 CE) launched from White Sands, New Mexico at local noon on June 27, 1980 to an apogee of 260 km. Three components of the O I(1304 A) multiplet were measured at zenith angles of approximately 50 and 140 deg at 1.1 A resolution. Over the entire altitude range of observation, i.e., 100-260 km, the three components were found to be equal to within + or - 15%. The shape of the O I(989 A) multiplet distribution observed on the flight at 1.3 A resolution was indistinguishable from an optically thin source with the energy levels of the excited state populated according to their statistical weights in spite of the large optical depths of the O I(989 A) multiplet at rocket altitudes.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 87; Aug. 1
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  • 6
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    The ultraviolet dayglow at solar maximum. 1 - Far UV spectroscopy at 3.5 A resolution (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The earth's far ultraviolet dayglow (1080-1515 A) was observed at about 3.5 A resolution during a period of high solar activity near solar maximum om June 27, 1980. The observations were made at local noon by rocket-borne spectrometers viewing toward the earth's northern limb at 90 deg zenith angle (ZA) at altitudes between 100 and 245 km, and at 98 deg ZA between 245 and 260 km. The zenith angle was 8.9 deg. These spectra are compared with earlier lower-resolution dayglow data obtained during a period of lower solar activity and with auroral spectra. The brightness ratio of O I 1356 to the N2 Lyman-Birge-Hopfield (LBH) system, an indicator of the O to N2 density ratio, is lower than that previously measured at mid-latitudes and closer to the value found in aurorae. In the LBH system a depletion of the bands originating on the v-prime = 3 vibrational level of the excited state is found. Some weak N2 Birge-Hopfield bands and N I lines only marginally detected previously in the dayglow are confirmed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 6594-660
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  • 7
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    EUV airglow during active solar conditions. II - Emission between 530 and 930 A (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Instrumentation on the Astrobee F sounding rocket on June 27, 1980 gathered EUV airglow data in the 530-930 A range. The 2-4 A resolution data were examined specifically for O II emission lines below 800 A, which were centered at 537-539 A. The emision was attributed to doublet and quartet components and exhibited a branching ratio of 3. A separate identification was made of O II emissions at 581 A. Inclusion of the 2s2p(4)2P state is therefore recommended in photoinization models of cometry and planetary atmospheres.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 11053-11
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  • 8
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    Auroral O I /989 A/ and O I /1027 A/ emissions (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Rocket observations of the extreme ultraviolet spectrum of the aurora from 550 to 1250 A are presented, and the results for the O I (989 A) and O I (1027 A) multiplets are examined in detail. The intensity of these emissions and the observed anisotropic radiation field are inconsistent with the relative intensity of the branching radiations. Several possible solutions to the problem are discussed, and evidence is presented that suggests the need to lower the branching ratios by several orders of magnitude.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Nov. 1
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  • 9
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    Conjugate photoelectron excitation of O I 4368 airglow emission. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Conjugate photoelectron fluxes are shown to be mainly responsible for the excitation of O I 4368 radiation observed with a grille spectrometer located at Langmuir Laboratory, New Mexico (L equals 1.7). On the basis of observations of O I 7774 and 4368 tropical emissions at Agulhas, Negras, Brazil (L equals 1.1), the contribution of radiative recombination to the New Mexico intensity is shown to be small. Conjugate photoelectron excitation at the Brazilian site has not been observed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; May 1
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  • 10
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    A rocket measurement of the extreme ultraviolet dayglow (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Extreme ultraviolet spectra of the mid-latitude dayglow in the wavelength range of 550 to 1250A have been obtained with a rocket borne grating spectrometer at a resolution of 20A. Spectra were obtained in the altitude range of 140 to 280 km. The spectra are dominated by emissions from atomic multiplets and no molecular bands have been identified with certainty. The strongest emissions other than H Lyman-alpha are OI (989) and OII (834). Other prominent emissions include He I(584), N II(916) and N II(1085). An unexpected feature near 612A has an intensity comparable to He I(584).
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 3; Apr. 197
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