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  • 1
    Electronic Resource
    Electronic Resource
    The spatial structure of the dayside ionospheric trough (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1169-1179 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere-magnetosphere interactions ; Polar ionosphere ; Radio science ; Ionospheric propagation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Tomographic imaging provides a powerful technique for obtaining images of the spatial distribution of ionospheric electron density at polar latitudes. The method, which involves monitoring radio transmissions from the Navy Navigation Satellite System at a meridional chain of ground receivers, has particular potential for complementing temporal measurements by other observing techniques such as the EISCAT incoherent-scatter radar facility. Tomographic reconstructions are presented here from a two-week campaign in November 1995 that show large-scale structuring of the polar ionosphere. Measurements by the EISCAT radar confirm the authenticity of the technique and provide additional information of the plasma electron and ion temperatures. The dayside trough, persistently observed at high latitudes during a geomagnetically quiet period but migrating to lower latitudes with increasing activity, is discussed in relationship to the pattern of the polarcap convection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1169-4
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  • 2
    Electronic Resource
    Electronic Resource
    First complementary observations by ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1519-1522 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere ; Auroral ionosphere ; Polar ionosphere ; Radio science (ionospheric physics)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Experimental results are presented from ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar. Tomographic measurements on 10 October 1996, showing a narrow, field-aligned enhancement in electron density in the post-noon sector of the dayside auroral zone, are related to a temporal increase in the plasma concentration observed by the incoherent scatter radar in the region where the HF radar indicated a low velocity sunwards convection. The results demonstrate the complementary nature of these three instruments for polar-cap ionospheric studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1519-2
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  • 3
    Electronic Resource
    Electronic Resource
    The benthic litter-dwelling macrofauna of the Amazonian forest stream Tarumã-Mirím: patterns of colonization and their implications for community stability (1994)
    Springer
    Hydrobiologia 291 (1994), S. 75-92 
    Details
    ISSN: 1573-5117
    Keywords: Amazonas ; Inundation forest ; forest streams benthic fauna ; litter habitat ; competition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Between 1983 and 1988 a total of 928 litter-filled baskets (1.8 1 volume), exposed for various periods on a stream litterbank and in its vicinity, collected 2703 individuals of 122 macrofaunal species, excluding chironomids. Species abundance was analysed in relation to exposure time, annual inundation cycle, water depth and sample size. Long-term, average species packing and animal density proved to be relatively invariant and revealed non-random frequency patterns. Previous and present data indicate that these patterns are a function of regular, specific life cycles and of intra-specific, stereotype behaviour in relation to space and litter quality, among other possibilities not considered here. Potential competition for space in these communities is discussed, considering the assumption of individual random movement versus species maintenance as a function of genetically and neurophysiologically in ormed, non-random behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044437
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