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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 116 (1978), S. 1101-1113 
    ISSN: 1420-9136
    Keywords: Aerosol ; Recombination ; Small ion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract It could be shown by measurements of the air conductivity and using a mean profile for the ionization rate that experimental and theoretical values of the recombination rate of small ions based on a three body recombination process (Thomson) are in very good agreement up to 20 km altitude. The divergency of the experimental and theoretical curves above 20 km can be interpreted by assuming that there exists in this altitude region a crossover from the three body recombination to a two body recombination process. The value of the recombination coefficient is about 4·10−7 cm3 s−1 in 25 km altitude, compared with 1.4·10−6 cm3 s−1 at ground level. Furtheron it was possible for the first time to get some experimental data of attachment coefficients up to 13 km from simultaneous measurements of the air conductivity and Aitken nuclei concentration. These values are in good agreement with those obtained by theoretical considerations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 112 (1974), S. 877-885 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Details of a new instrument to measure the concentration of Aitken nuclei (0.01 μm≤r≤0.1 μm), using the expansion chamber principle are discussed. The instrument automatically samples the air for its content of Aitken nuclei and the data are recorded photographically. The instrument was designed for concentrations in the range 1 to 1000 particles/cm3. The first balloon flights with the instrument were made in October 1973. The profiles show an approximately constant concentration of 300 particles/cm3 between 5 and 10 km, a decrease by an order of magnitude to 20 particles/cm3 in the region between 10 and 20 km, and then the concentration remains relatively constant at 20 particles/cm3 above 20 km. These measurements are also compared with older measurements.
    Type of Medium: Electronic Resource
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