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  • 1
    Electronic Resource
    Electronic Resource
    The role of vibrationally excited nitrogen in the ionosphere (1988)
    Springer
    Pure and applied geophysics 127 (1988), S. 529-544 
    Details
    ISSN: 1420-9136
    Keywords: Ionosphere ; nitrogen ; vibrational temperatures ; N2 and CO2 and populations of N2 and CO2 in the D, E and F regions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Theoretical and experimental aspects of the production, transformation, diffusion and loss of N2 in the upper atmosphere are considered. The N2-CO2 near-resonant system in theD andE regions is taken into account. We describe our understanding of the methods necessary to find the vibrational populations of N2 and CO2 (asymmetric mode of CO2). The calculations of the vibrational temperatures in theD, E, andF regions for the mid-latitude ionosphere and an aurora are presented. The connection between the excited species and the 4.26-μm radiation intensities is considered. The models for the rate coefficient of the reaction of O+ with N2 and the electron density decrease resulting from N2 in the F region are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879824
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New electron energy transfer rates for vibrational excitation of N2 (1998)
    Springer
    Annales geophysicae 16 (1998), S. 176-182 
    Details
    ISSN: 0992-7689
    Keywords: Atmospheric composition and structure ; Thermosphere ; Ionosphere ; Modeling and forecasting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In this paper we present the results of a study of the electron cooling rate, the production rates of vibrationally excited N2(v), and the production frequency of the N2 vibrational quanta arising from the collisions of electrons with unexcited N2(0) and vibrationally excited N2(1) molecules as functions of the electron temperature. The electron energy transfer rates for vibrational excitation of N2 have been calculated and fit to analytical expressions by use of the revised vibrationally excited N2 cross sections. These new analytical expressions are available to the researcher for quick reference and accurate computer modeling with a minimum of calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0176-9
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill (1998)
    Springer
    Annales geophysicae 16 (1998), S. 460-469 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (Ion chemistry and composition Ionosphere-atmosphere interactions Mid-latitude ionosphere)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract This study compares the observed behavior of the F region ionosphere over Millstone Hill with calculations from the IZMIRAN model for solar minimum for the geomagnetically quiet period 23–25 June 1986, when anomalously low values of hmF2(〈200 km) were observed. We found that these low values of hmF2 (seen as a G condition on ionograms) exist in the ionosphere due to a decrease of production rates of oxygen ions resulting from low values of atomic oxygen density. Results show that determination of a G condition using incoherent scatter radar data is sensitive both to the true concentration of O+ relative to the molecular ions, and to the ion composition model assumed in the data reduction process. The increase in the O+ + N2 loss rate due to vibrationally excited N2 produces a reduction in NmF2 of typically 5–10%, but as large as 15%, bringing the model and data into better agreement. The effect of vibrationally excited NO+ ions on electron densities is negligible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0460-8
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    Paper (German National Licenses)
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