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  • 1
    Electronic Resource
    Electronic Resource
    A 15.7-min periodicity in OJ287 (1985)
    [s.l.] : Nature Publishing Group
    Nature 314 (1985), S. 148-149 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the Turku-Otaniemi quasar variability monitoring programme9, 20 quasar-type objects are observed for a period of, in the mean, one week each month with the 13.7-m radio telescope of the Helsinki University of Technology at Metsahovi, Finland. Each source is observed for a period of 1-2 h. During ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/314148a0
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  • 2
    Electronic Resource
    Electronic Resource
    Solar differential rotation determined by polar crown filaments (1991)
    Springer
    Solar physics 133 (1991), S. 195-203 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The rotation rates obtained by tracing 124 polar crown filaments are presented in comparison with previous results. Higher filament rotation rate in polar regions was detected and discussed in terms of the various phenomena such as: the projection effect due to the height of measured tracers, the connection of polar filaments with the magnetic field patterns which show an increase of the rotation rate at high latitudes, rigid rotation of polar filaments which form pivot points, and eventual change of the differential rotation law during the cycle. However, when the height correction for an average height of 1% of the solar radius is applied, the filament rotation rate in polar regions decreases. Then the rotation law becomes: Ω(φ) = 14.45 − 0.11 sin2 φ − 3.69 sin4 φ (° day−1, sidereal).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149885
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  • 3
    Electronic Resource
    Electronic Resource
    Large-scale patterns on the Sun observed in the millimetric wavelength range (1992)
    Springer
    Solar physics 137 (1992), S. 67-86 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nature and behaviour of large-scale patterns on the solar surface, indicated by the areas of brightness-temperature depressions in the millimetric wavelength range, is studied. A large sample of 346 individual, low-temperature regions (LTRs) was employed to provide reliable statistical evidence. An association of 99% was found between the locations of LTRs and the large-scale magnetic field inversion lines, and 60% of the LTRs were associated with the inversion line filaments. A tentative physical association with filaments is reconsidered, and one particularly well-observed case is presented. The heights of the perturbers causing brightness-temperature depressions are discussed. The long-term evolution of the latitudinal distribution of LTRs is presented in a butterfly diagram. Two belts of low-temperature regions outline the active region belts, shifting with them towards the equator during the solar activity cycle. The low-temperature region belts of the forthcoming cycle appear already at the maximum of the actual cycle at latitudes of about 55 °. The superpositions of the temperature minima distributions in the synoptic maps show patterns appearing as ‘giant cells’ and compatible with indications inferred from magnetographic data. The reliability of the inferred cells is considered, and a statistical analysis reveals a negligible probability for an accidental distribution appearing in the form of giant cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146576
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