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  • 1
    Digitale Medien
    Digitale Medien
    Counter-streaming gas flows in solar prominences as evidence for vertical magnetic fields (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 396 (1998), S. 440-441 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Solar prominences are sheets of relatively cool and dense gas embedded in the surrounding hotter corona. An erupting prominence can inject a mass of up to 1015 g into the solar wind as part of a coronal mass ejection. These eruptions must depend critically on the topology ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/24798
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The anatomy of the Sun (1992)
    [s.l.] : Nature Publishing Group
    Nature 357 (1992), S. 552-552 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] OUR Sun proves the rule that the closer you look at anything in nature, the more complicated it becomes. For at least 40 years, astronomers have sought satisfac-tory explanations for some of the most obvious solar phenomena. Why does the Sun's equator rotate faster than its poles? Why is its ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/357552a0
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  • 3
    Digitale Medien
    Digitale Medien
    The excitation equilibrium of coronal ions (1970)
    Springer
    Solar physics 11 (1970), S. 68-81 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The relative populations of levels of highly ionized Fe, Ni and Ca ions have been calculated for physical conditions appropriate to the solar corona. The results are presented in the form of tables. Line intensity ratios in the EUV and visible that are sensitive to electron density are discussed and compared with observations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00156552
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  • 4
    Digitale Medien
    Digitale Medien
    Interferometric imaging: A numerical simulation (1987)
    Springer
    Solar physics 111 (1987), S. 235-242 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Non-redundant arrays offer the possibility of reconstructing optical solar images to the diffraction limit of resolution, with minimal data processing. A particular algorithm, due to W. T. Rhodes, for the analysis of the fringes produced by a set of non-redundant arrays, has been evaluated numerically. The algorithm can give satisfactory results with S/N ∼ 100, but can also break down at moments of unfavorable seeing.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00148516
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  • 5
    Digitale Medien
    Digitale Medien
    Interferometric imaging II: (1989)
    Springer
    Solar physics 120 (1989), S. 253-259 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Non-redundant arrays offer a promising technique for producing diffraction-limited solar images. Pairs of two-dimensional non-redundant arrays yield sufficient information to recover the phases of all the spatial frequencies to which they respond. The algorithms to select and test such pairs are given and applied to a particular example.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00159879
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  • 6
    Digitale Medien
    Digitale Medien
    Prominence fine structure (1990)
    Springer
    Solar physics 127 (1990), S. 109-118 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The vertical fine structure in a quiescent prominence was modelled as an assembly of very narrow, optically thin threads. Random clusterings of the threads can account for the observed contrast and Hα line profiles of the fine structures. In this picture, each structure consists of a cluster of 7–20 elementary threads.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00158516
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  • 7
    Digitale Medien
    Digitale Medien
    Nanoflare mechanisms: Twisting and braiding (1993)
    Springer
    Solar physics 144 (1993), S. 341-347 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this paper we will show that the twisting mechanism of Sturrock and Uchida is as viable a heating source for the active corona as Parker's braiding. This conclusion contradicts that of Berger (1990). Moreover, we shall show that if we adopt Berger's criterion for reconnection, braiding produces far more flare energy than is observed. A modified criterion, consistent with twisting, produces insufficient heating but, coupled to an avalanche process, could account for active region flares.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00627598
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  • 8
    Digitale Medien
    Digitale Medien
    On the motions of chromospheric fine-structure in a weak plage (1967)
    Springer
    Solar physics 1 (1967), S. 204-215 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Motions in an old center of activity have been studied at the limb with the use of timeresolved Hα spectra. The observations were made at intervals of 5 seconds over a period of 3/4 hour of good seeing at Sacramento Peak Observatory. Objects in this region have larger line-of-sight velocities than have been reported for spicules in quiet regions. Velocities as high as 70 km/sec were observed; seventeen percent of a sample of 200 instantaneous velocities exceed 30 km/sec. The line-of-sight velocities of 20 objects were measured as a function of time. For 5 of these, transverse velocity components could also be estimated. A single pattern, such as the simple rise without fall reported by Mouradian, does not exist. The motion is often quite complex, involving lateral expansion, shear and occasionally splitting. Reversal of sign of the velocity is not uncommon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00150855
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  • 9
    Digitale Medien
    Digitale Medien
    The solar H and K lines of ionized calcium (1968)
    Springer
    Solar physics 3 (1968), S. 164-180 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Photographic observations of the mean H and K profiles are given for several positions across the solar disk (0.1 〈 μ 〈 0.6). The core profiles of H and K are nearly identical at the same position on the sun. Estimates of the mean Doppler width and the depth of formation of the K2 emission peaks are given. A more elaborate analysis confirms that the K2 peaks are formed in a relatively shallow layer (τ 0 ∼ 3) in which the Doppler width decreases rapidly inward. The relevance of these conclusions to current attempts to predict theoretically the H and K profiles is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00154252
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  • 10
    Digitale Medien
    Digitale Medien
    The interpretation of total line intensities from optically thin gases (1972)
    Springer
    Solar physics 22 (1972), S. 317-326 
    Details
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We discuss the application of a general diagnostic procedure, developed in the preceding paper of this series, to the inference of the physical state of coronal condensations from a knowledge of their forbidden line emission. We consider the limitations set on such an analysis by inadequacies in existing data and indicate the additional observations in the infrared and ultraviolet, as well as the visible, which will be needed for development of the full power of the diagnostic method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00148699
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