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  • 1965-1969  (1)
  • 1960-1964  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Solar Flux Fluctuations at 225 Mc/s and Noise-level of Atmospherics at 27 Kc/s (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 363-364 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For this purpose the Wolf relative number R is usually considered as an index of solar activity, and the absorption of the D layer during the processes of ionospheric reflexion as an index of the ionospheric effect2,3. In our work, two different parameters have been used instead: the level of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199363a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radio observation of the solar eclipse of May 20, 1966 (1969)
    Springer
    Solar physics 7 (1969), S. 276-294 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The eclipse of May 20, 1966 was observed at the wavelengths of 3.2 and 9.1 cm by three Arcetri expeditions. The curves obtained by deriving the occultation curves have been filtered by digital techniques to cut off high frequency noise; by them, many characteristics of three sources of the S-component present on the disk have been studied: temperature, dimensions, emitted flux and brightness distribution. Isophotes of the latter are compared with isophotes of the corresponding Hα plages for two sources: a close similarity results for one of them. Moreover it is shown that: (a) the height above the photosphere of the sources at λ = 9.1 cm is greater than that of the sources at λ = 3.2 cm; (b) the maximum of the radio emission is not always placed exactly above a sunspot or above the sunspot group barycentre. Fitting the observed brightness temperatures, as frequency functions, by a power law and using a temperature model of an active region, the electron density distribution can be deduced. The obtained electron density distributions are compared with various models of active regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224907
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    Paper (German National Licenses)
    Fulltext
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