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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Observations of steady anomalous magnetic heating in thin current sheets (1985)
    Springer
    Solar physics 96 (1985), S. 253-275 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A faint steadily emitting loop-like structure has been observed by HXIS in its low energy channels (3.5–8.0 keV) on November 5/6, 1980. These HXIS observations have permitted us to follow the thermal evolution of this loop for a period of about 15 hr and from this study we conclude that only a fraction of 0.1% of the volume of the loop is steadily heated at the rather large rate of 0.6 erg cm-3 s-1. We interpret this heating as the dissipation of magnetic fields in thin current sheets and we find that the dissipation with classical resistivity is very unlikely, while ion-kinetic tearing, as proposed by Galeev et al. (1981), suits the observations very well. The enhancement of the resistivity over the classical resistivity then turns out to be a factor 4 × 104. Dissipation in extremely thin sheets via the ion-acoustic instability (Duijveman et al., 1981) cannot be completely excluded when the cross-field heat conductivity is anomalously enhanced by a factor 400. We identify the source of the X-ray emission in this paper with the Hα filament in the same region. The hot X-ray emitting plasma and the cool plasma radiating in Hα are thermally separated by the strong magnetic field. The main conclusion of the paper is that for the first time direct evidence is found for the steady dissipation of coronal magnetic fields via enhanced resistivity in thin current sheets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149683
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Results of a filtering procedure in low tension glaucoma (1989)
    Springer
    International ophthalmology 13 (1989), S. 131-138 
    Details
    ISSN: 1573-2630
    Keywords: low-tension glaucoma ; visual field ; filtering surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-six eyes of twenty patients with established low tension glaucoma, who had either a ‘double flap’ Scheie filtering operation or a trabeculectomy, were followed over a period ranging from one to ten years, with a median of three years. These 26 eyes include two second eyes that served as a contralateral control eye until the visual field deteriorated. All 26 eyes showed progression of visual field defects preoperatively, while postoperatively only 2 eyes showed further progression. Of the 16 nonoperated contralateral eyes, 7 showed progression of visual field defects over the same follow-up period. Two of these 7 eyes had to be operated during the study-period. The difference in progression between the operated and the non-operated eyes was significant (P〈0.01). The diltering procedure provided a reduction in IOP of 20% or more in 21 of 26 eyes. There was a significant difference in the mean intraocular pressure (IOP) between the operated and the non-operated contralateral eye of 6.8 mmHg (37%) at one year postoperatively. The diurnal variation decreased highly significantly from 4.3 to 2.1 mmHg (P〈0.001). It is concluded that filtering surgery in low tension glaucoma may result not only in a significant lowering of IOP, but is also effective in slowing further deterioration of the visual fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02028653
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Book reviews (1986)
    Springer
    Space science reviews 44 (1986), S. 393-409 
    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/BF00200821
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Book review (1988)
    Springer
    Solar physics 117 (1988), S. 203-203 
    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/BF00148584
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    Paper (German National Licenses)
    Fulltext
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