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  • 1
    Electronic Resource
    Electronic Resource
    Persistent X-ray emission from a γ -ray burst source (1982)
    [s.l.] : Nature Publishing Group
    Nature 300 (1982), S. 730-731 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The interplanetary burst network timing of y bursts has yielded several relatively precise error boxes for source locations. One of these, the 5 arcmin2 location1 of the y burst detected on 19 November 1978 (GBS0117-29) led to the discovery of its probable optical counterpart from a brief optical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/300730a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A search for hard X-ray microflares near solar minimum (1991)
    Springer
    Solar physics 135 (1991), S. 57-64 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near solar maximum, hard X-ray microflares with peak 20 keV fluxes of ≳10−2 (cm2 s keV)−1, more than ten times smaller than for typical flares and subflares, can occur at the rate of about once every five minutes. We report here on a search for hard X-ray microflares made on a long duration balloon flight in February 1987 near solar minimum, at a time when no active regions were on the Sun. No microflares were observed over a total observing time of 16.5 hours spread over three days, implying a statistical upper limit to their rate of occurrence about a factor often lower than observed near solar maximum. Thus hard X-ray microflaring appears to be an active region phenomenon, and apparently not associated with flaring of soft X-ray bright points.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146698
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The most dilute lake in the world? (1990)
    Springer
    Hydrobiologia 199 (1990), S. 1-6 
    Details
    ISSN: 1573-5117
    Keywords: base cations ; conductivity ; dilute lakes ; hydrology ; Oregon Cascades
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lake Notasha, near the crest of the Oregon Cascade mountain range, is the most dilute lake known. The measured conductivity during two visits was 1.3 and 1.6 µS cm−1 with a sum of base cations of 9 and 18 µeq L−1; bicarbonate was the dominant anion. Most of the cations in the lake can be accounted for by evapoconcentration of precipitation, although input of weathering products cannot be excluded as a source. The topographic watershed has a mixed coniferous forest, but the physical setting of the lake apparently minimizes hydrologic and ionic contributions from the watershed. This feature makes lakes such as Notasha appropriate receptors for monitoring atmospheric contaminants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007827
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    Paper (German National Licenses)
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