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  • 1
    Electronic Resource
    Electronic Resource
    On the variability of I(7620 Å)/I(5577 Å) in low altitude aurora (1999)
    Springer
    Annales geophysicae 17 (1999), S. 913-918 
    Details
    ISSN: 0992-7689
    Keywords: Atmospheric composition and structure (airglow and aurora)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An auroral electron excitation model, combined with simple equilibrium neutral and ion chemistry models, is used to investigate the optical emission processes and height profiles of I(5577 Å) and I(7620 Å) in the 90 to 100 km altitude region. It is shown that the apparent discrepancies between ground-based and rocket-borne auroral observations of the I(7620 Å)/I(5577 Å) ratio are due to the extreme height variation of this intensity ratio in the 90 to 100 km region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-0913-8
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  • 2
    Electronic Resource
    Electronic Resource
    On I(5577 Å) and I (7620 Å) auroral emissions and atomic oxygen densities (1996)
    Springer
    Annales geophysicae 14 (1996), S. 687-698 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A model of auroral electron deposition processes has been developed using Monte Carlo techniques to simulate electron transport and energy loss. The computed differential electron flux and pitch angle were compared with in situ auroral observations to provide a check on the accuracy of the model. As part of the energy loss process, a tally was kept of electronic excitation and ionization of the important atomic and molecular states. The optical emission rates from these excited states were computed and compared with auroral observations of 〈eta〉(3914 Å), 〈eta〉(5577 Å), 〈eta〉(7620 Å) and 〈eta〉(N2VK). In particular, the roles played by energy transfer from N2(A3〈Sigma〉+u) and by other processes in the excitation of O(1S) and O2(b1〈Sigma〉+g) were investigated in detail. It is concluded that the N2(A3〈Sigma〉+u) mechanism is dominant for the production of OI(5577 Å) in the peak emission region of normal aurora, although the production efficiency is much smaller than the measured laboratory value; above 150 km electron impact on atomic oxygen is dominant. Atomic oxygen densities in the range of 0.75±0.25 MSIS-86 [O] were derived from the optical comparisons for auroral latitudes in mid-winter for various levels of solar and magnetic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-996-0687-1
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of the (0,0) Band of the ( 1 Δ g – 3 Σ g − ) System of Oxygen in the Day and Twilight Airglow (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 157-158 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Dayglow spectrum obtained from a height of 13 km at a zenith angle of 55 . The (0,0) oxygen (O2) band is shown. The spectral slit width was 100 Å and the solar zenith distance was 40 Fig. 2. Twilight airglow spectra obtained from a height of 13 km at a zenith angle of 75 . The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/196157a0
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  • 4
    Electronic Resource
    Electronic Resource
    Rotational Structure of the 3914 A. N 2 + Band in Sunlit Auroræ (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 453-454 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The lower dispersion spectra show unusually high relative intensities of the first negative N2+ bands for higher vibrational levels; this effect was first observed by Stormer and explained by Bates2 as due to an abnormal distribution of the populations of the vibrational levels of N2+ resulting ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183453b0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ca II Emission Lines in the Twilight Spectrum (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 276-277 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The wave-lengths of the H and K lines of ionized calcium are 3933.7 A. and 3968.5 A. Comparison of the measured wave-lengths with the M.I.T. Wavelength Tables 1 showed that no other element besides Ca II could give rise to both emission lines. A measured intensity ratio of 2.1 ± 0.5 is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/178276a0
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  • 6
    Electronic Resource
    Electronic Resource
    Observations of the Lithium Lines in the Twilight Airglow in the Northern Hemisphere (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1315-1316 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Twilight spectra covering the region 6000-7000 A. have been obtained at Saskatoon regularly since January 1959. An //0-8 auroral grating spectro-graph7 was used to photograph the spectrum on Kodak 103 a-F plates. During the exposures the spectrograph was guided according to an exposure programme ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831315b0
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  • 7
    Electronic Resource
    Electronic Resource
    Infra-red Spectrum of the Night Sky near 10000 A. (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 950-951 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The measured wave-lengths of the stronger features are recorded in Table 1. Almost all the features can be attributed to lines and branches of the (5,2), (4,1), (3,0), (9,5) and (8,4) OH rotation-vibration bands. The predicted wave-lengths (in air) for the lines of the (5,2), (4,1) and (3,0) bands ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/175950a0
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  • 8
    Electronic Resource
    Electronic Resource
    Spectrum of the Night Sky in the Range 1.2–2 µ (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 496-496 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The graph shows a plot of cell signal against wavelength, the average of five runs obtained at Saskatoon during the nights of June 14, 21 and 22, 1953. The spectrometer was directed towards a point in the sky about 15 above the northern horizon. Artificial lights were absent in this direction for a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172496a0
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  • 9
    Electronic Resource
    Electronic Resource
    Canopus — A ground-based instrument array for remote sensing the high latitude ionosphere during the ISTP/GGS program (1995)
    Springer
    Space science reviews 71 (1995), S. 743-760 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Proper interpretation ofin situ satellite data requires a knowledge of the global state of the magnetosphere-ionosphere system. CANOPUS is a large-scale array of remote sensing equipment monitoring the high latitude ionosphere from the north-central to the north-west portion of North America. The array comprises thirteen magnetometers and riometers four meridian scanning photometers, a digital allsky imager and an auroral radar linked by geostationary satellite to a central receiving node in Ottawa, where the data are archived and made available in near real time to participating scientists. This paper provides a technical description of the various instruments in the CANOPUS array, and contains a summary of the key parameters which will be provided to the Central Data Handling Facility (CDHF) located at NASA/Goddard Space Flight Center, for use by the ISTP/GGS community.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00751349
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  • 10
    Electronic Resource
    Electronic Resource
    The infrared spectrum of the airglow (1973)
    Springer
    Space science reviews 15 (1973), S. 355-400 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The techniques of studying the IR airglow are briefly discussed followed by a review of recent observations. The main emphasis is on the molecular emissions of OH and O2 from the mesosphere and lower thermosphere with a shorter discussion of the F-region atomic emissions. The theoretical interpretations of these emissions are reviewed. It is concluded that dynamic effects must play a dominant and as yet incompletely understood part in the photochemistry of the molecular emission region. An atlas of recently available airglow spectra is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00169323
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