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  • 1980-1984  (5)
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  • 1
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    Solar global velocity oscillations and active region rotation (1983)
    Springer Nature
    Details
    Publication Date: 1983-02-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 2
    Electronic Resource
    Electronic Resource
    Solar global velocity oscillations and active region rotation (1983)
    [s.l.] : Nature Publishing Group
    Nature 301 (1983), S. 589-591 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations of Claverie et al.1 best demonstrate a periodicity in the line-of-sight velocity of the integrated solar disk during the interval 28 June to 22 August 1981 (see Fig. la). They find a period of 13.15 days (synodic) and an amplitude of 6.6 m s"1. This period is quite close to being ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/301589a0
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  • 3
    Electronic Resource
    Electronic Resource
    Rms-value and power spectrum of the photospheric intensity-fluctuations (1981)
    Springer
    Solar physics 73 (1981), S. 217-231 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The power spectrum and the rms-value of the granular intensity fluctuations were studied using granulation photographs of excellent quality obtained during the JOSO site testing campaign 1979 at Izaña. The observed power spectrum was corrected using various effective modulation transfer functions of the system: telescope+aberrations+atmospheric seeing, assuming different contributions of the atmospheric seeing. With this procedure a lower and upper limit for the ‘true’ power spectrum of the granular intensity fluctuations and thus for the rms-value could be derived: 7.2% 〈I rms 〈12% at λ = 550 nm, with a most probable value of I rms = 10.5%. We checked the validity of the upper limit by applying to our data a MTF (Deubner and Mattig, 1975), which certainly must lead to an overcorrection. This procedure lead to I rms = 13.4%. Thus we can state that the true rms-value of the granular intensity fluctuations does certainly not exceed 13% at λ = 550 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151679
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  • 4
    Electronic Resource
    Electronic Resource
    On the centre-to-limb variation and latitude dependence of the asymmetry and wavelength shift of the solar line λ 5576 (1982)
    Springer
    Solar physics 79 (1982), S. 3-18 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low noise photoelectric measurements of the line profile of the g = 0 Fe line gl 5576.097 combined with determinations of the wavelength shift of its centre calibrated by use of an I 2 absorption tube are reported. Measurements taken at various limb distances (1.0 ≤ cos ϑ ≤ 0.2) and along 4 different diameters of the Sun are used to investigate the behaviour of the line asymmetry (C-shape) and wavelength shift of the line centre as functions of cos ϑ and of latitude and to search for possible pole-equator differences. An accuracy of approx. 0.8 mÅ r.m.s. is achieved for the determination of the centre of the solar line relative to the iodine lines and of 0.3 mÅ to 1 mÅ r.m.s. for the relative variations of the C-shape. The analysis shows a significant difference between the limb-effect curves along polar and equatorial diameters for cos ϑ ≤ 0.4 and changes of the C-shape for 0.9 ≥ cos ϑ ≥ 0.6 with a rather strong indication of a latitude dependence of the C-shape. This latitude dependence may account for the so-called ‘ears’ observed by Howard et al. (1980) who used the well-known Doppler compensator method which integrates the line asymmetry from the line wings to the core.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146969
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  • 5
    Electronic Resource
    Electronic Resource
    On diurnal variations of the solar rotation rate as derived from sunspot tracings (1981)
    Springer
    Solar physics 71 (1981), S. 395-399 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The heliographic positions of more than 100 sunspots were accurately measured several times a day from 1974 until 1979 by means of the computer-controlled tracing method described by Schröter and Wöhl (1975). A striking degree of constancy of the solar rotation rate (about 0.15% or 3 m s−1) is found, when east-west proper motion components of each individual stable sunspot is considered. However, large differences of the rotation rate are observed (up to 7% or 130 m s−1) when comparing different sunspots. We found no significant correlation of these fluctuations with characteristics of the sunspots (age, evolution, etc.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167561
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