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  • 1975-1979  (28)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Excited cosmic plasmas (1978)
    Springer
    Astrophysics and space science 55 (1978), S. 147-168 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe some aspects of the energetic radiations of high-energy cosmical plasmas in stellar environments, mainly stellar chromospheres and coronae, and solar and stellar flare-type phenomena. As far as possible we discuss the morphology and physics of these plasmas, and we speculate on their origin. This paper is a review, partly of a historical character, describing particularly some contributions from the Astronomical Institute at Utrecht to this field of astrophysical research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642586
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  • 2
    Electronic Resource
    Electronic Resource
    Large turbulent elements in supergiant photospheres (1979)
    Springer
    Astrophysics and space science 62 (1979), S. 245-250 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract During the ‘cool phase’ of the super-supergiant HR 8752, which happened around 1973, when the star's spectral type was K2...K5 Ia+, the most probable vertical extent of the main turbulent elements in the star's photosphere was about 6 times the density scale height, which is about half the stellar radius. In early-type photospheres (class Ia) it is about 10 times the atmospheric density scale height (about 0.25 of the stellar radius), while in less extreme (luminosity class Ib) medium-type supergiants the most probable vertical extent of the elements is approx. 8 times the density scale height (≈0.05R). Large turbulent elements are apparently a common feature in supergiant photospheres; the more extreme the supergiant the larger the relative size of the eddies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643919
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  • 3
    Electronic Resource
    Electronic Resource
    Macro-and micro-turbulent filter functions for weak lines in stellar atmospheres (1979)
    Springer
    Astrophysics and space science 61 (1979), S. 129-141 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Following a similar discussion given earlier for the solar case (De Jager, 1972) we compute in this paper spectral line profiles for the spatial wavelengths in which a stellar motion field can be decomposed, and thereafter the macro-and micro-turbulent filter functionsf M(θk) andf μ(θk), where θ is the optical scale height andf 2(k) dk the fraction of the energy of the turbulent motions between wavenumbersk andk+dk of the spectrum of turbulence that contributes to either kind of turbulence. If micro-and macro-turbulent velocity components are known for a certain star, and if the spectrum of turbulence is sharp enough, the ratiof M/f μ would enable one to derive the average size of the turbulent elements in the star's atmosphere. The computations apply to weak lines in idealized stellar atmospheres, and refer to two cases: isotropic turbulence, and radial pulsations. These filters can be suitably used in a diagnostic method for the analysis of the motion field in the solar and stellar atmospheres. Some examples of applications to stars of very different kinds are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645797
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  • 4
    Electronic Resource
    Electronic Resource
    Preface (1976)
    Springer
    Solar physics 47 (1976), S. 9-9 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152239
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  • 5
    Electronic Resource
    Electronic Resource
    Properties of elementary flare bursts (1978)
    Springer
    Solar physics 58 (1978), S. 127-137 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From a study of eight hard X-ray flares, all with durations of less than five minutes, it is found that these flares can be completely decomposed into short-lived bursts, called Elementary Flare Bursts (EFB). For each one flare the individual EFB's have approximatively the same Full Width at Half Maximum (FWHM); average values range between 4 s (± 1 s) and 24 s (± 5 s) for the different flares. Yet there are significant differences between the FWHM's for the individual EFB's of a flare. The EFB's are slightly asymmetric; rise time is approx. 0.9 of the decay time. Their half-widths decrease with increasing photon energy, proportional to E -0.69±0.05.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152559
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  • 6
    Electronic Resource
    Electronic Resource
    An editorial note (1978)
    Springer
    Solar physics 60 (1978), S. 3-3 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152327
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  • 7
    Electronic Resource
    Electronic Resource
    Editorial (1978)
    Springer
    Solar physics 56 (1978), S. 3-4 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152629
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  • 8
    Electronic Resource
    Electronic Resource
    Improved values for the solar micro- and macro-turbulent filter functions (1977)
    Springer
    Solar physics 54 (1977), S. 313-317 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The contributions of any arbitrary photospheric velocity field to (macroturbulent) line displacement, and to (microturbulent) line broadening can be expressed by the macro- and micro-turbulent filters f M (k) and f t(k), where k is the wavenumber of the energy spectrum in which the line-of-sight component of the velocity field can be decomposed. As a correction to a previous computation of f M and f t we give in this Note improved values for the filter functions for weak lines in LTE. An example of the way to use the filter functions is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00159921
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  • 9
    Electronic Resource
    Electronic Resource
    On the seats of elementary flare bursts (1979)
    Springer
    Solar physics 64 (1979), S. 135-141 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We suggest to identify the elementary flare bursts with the excitation of the small kernels that occur in flare loops that are observed in soft X-ray pictures of flares. We stress the need of simultaneous observations of spatial structure and time variations of hard X-ray bursts sources in various wavelength regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151122
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1978)
    Springer
    Space science reviews 22 (1978), S. 213-218 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212074
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