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  • 1
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    Observations of shadow bands at the total solar eclipse of 16 February 1980 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Photoelectric observations of short term light variations (shadow bands) at the 16 Feb. 1980 total solar eclipse have been made using a set of spatially separated PIN diodes. Light variations in a bandpass of 1-500 Hz were detected during the half-minutes preceding and following the total phase. Fourier analysis of the noise spectrum of the variations reveals a sharp drop-off for frequencies above 50 Hz and an overall spectrum quite similar to previously reported power spectra of stellar scintillation. This is consistent with an atmospheric origin for the shadow bands. Cross-correlations between the detector outputs are low, suggesting a short persistence time for the turbulent elements causing the patterns.
    Keywords: GEOPHYSICS
    Type: Applied Optics (ISSN 0003-6935); 23; 4390-439
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Midlatitude oxygen ultraviolet nightglow (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A rocket-borne spectrometer measured the weak UV nightglow from 1240 to 1670 A in the altitude range 180-345 km above White Sands, New Mexico. Detection of nightglow emissions at the atomic oxygen lines (1304 and 1356 A) confirmed the existence of a weak midlatitude oxygen nightglow similar to the tropical airglow. Radiative recombination appeared to be the principal cause of the peak observed intensities of the atomic oxygen line emissions, though a maximum 25% contribution from mutual neutralization of O(+) and O(-) could also be contemplated. Partial radiative recombination coefficients are derived from the data.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 5; May 1978
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    NASA TECHNICAL REPORTS
  • 3
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    Upper limits on spacecraft-induced ultraviolet emissions from the Space Shuttle (STS-61C) (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results are reported from a search for band emission of N2, OH, O2, and NO in nightglow spectra obtained in January 1986 with the Johns Hopkins UV background experiment (UVX) flown on the Space Shuttle Columbia (STS-61C) at an altitude of 330 km. The experiment consisted of two Ebert monochromators spanning the spectral range from 1200 to 1700 A at 17-A resolution and from 1600 to 3200 A at 29-A resolution. UV shuttle glow emission was not detected at a 330-km altitude with 3-sigma upper limits based on counting statistics on N2 LBH, O2 Herzberg, and NO delta, gamma, and beta of 5.3, 4.5, 0.6, 0.7, and 3.5 R of total band emission, respectively. The upper limit on the OH (A 2Sigma-u(+) - X2Pi)(0,0) and (1,0) band emission is 0.1 R. The branching ratio of the NO C2Pi state to the A2Sigma(+) state was determined from the UVX experiment by measuring the ratio of the total emission rate from the delta-band system to that of the gamma-band system. The branching ratio for the C2Pi state to the A2Sigma(+) state is 0.37 +/-0.03.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; 1633-163
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  • 4
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    Near-midnight observations of nitric oxide delta- and gamma-band chemiluminescence (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Chemiluminescent nightglow emission of the nitric oxide delta and gamma bands was measured from a sounding rocket launched on April 27, 1981, near local midnight. The integrated band emission rates for this near zenith observation above 205 km were less than 10 Rayleighs. The solar zenith angle was 127 deg. The branching ratio from the C2Pi state to the A2Sigma(+) state of NO was determined from comparison of the total emission rate of the delta band system to that of the gamma band system and found to be 0.30 + or - 0.06. The branching ratios within each of the band systems were found to be consistent with previous theoretical and experimental determinations. The vertical atomic nitrogen distribution, derived with the use of a model atmosphere, was found to have a peak density of 2.0 x 10 to the 7th atoms/cu cm at an altitude of 205 km. The analysis of these data indicate the presence of residual NO emission above 270 km at local midnight on the order of 1 Rayleigh of total band emission.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 10141-10
    Format: text
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