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  • 2000-2004  (2)
  • 1965-1969  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    High-resolution measurements of photosphere and sunspot velocity and magnetic fields using a narrow-band birefringent filter (1968)
    Springer
    Solar physics 3 (1968), S. 258-268 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Modifications to a Zeiss 1/4 Å filter are described which allow high spatial resolution observations of the line-of-sight velocities and magnetic fields in the photosphere and in sunspots. First results show: (1) the granular velocity field to be very strong; differences in upward motions in the granules and downward motions in between are as much as 6 km/sec; (2) the Evershed effect in sunspots to originate primarily in the dark regions between bright penumbral filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155161
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The intensity, velocity and magnetic structure of a sunspot region (1968)
    Springer
    Solar physics 4 (1968), S. 142-164 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The observational set-up for a detailed study of the velocity, intensity and magnetic-field fine structure in and around a sunspot is described. On highly resolved spectra we detected in the vicinity of a sunspot a large number of points with strong magnetic fields (magnetic knots). The magnetic field in these knots causes a striking decrease of the line depth (or a ‘line gap’ after Sheeley, 1967). The properties of the magnetic knots are: (1) magnetic fields up to 1400 gauss; (2) diameter ≈ 1100 km; (3) coincidence with dark intergranular spaces; (4) generally downward material motion; (5) lifetime〉30min; (6) estimated total number around an unipolar spot ⩾ 2000; (7) combined magnetic flux comparable to the sunspot flux; (8) coincidence with Ca+ plages. For the smallest sunspots (pores) we obtained magnetic fields 〉1500 gauss. Hence a magnetic field of about 1400–1500 gauss appears to be a rather critical level for pore and spot formation. We found a large number of small areas producing line gaps without measurable magnetic field. These ‘non-magnetic gap-regions’ coincide with bright continuum structures. Some aspects arising from the occurrence of hundreds of magnetic knots in an active region are discussed in the last section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148076
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Principles of operation of solar magnetographs (1968)
    Springer
    Solar physics 5 (1968), S. 15-28 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The principles of operation of photoelectric solar magnetographs are described in terms of the Poincaré sphere. The performance of photographic methods for measuring solar magnetic fields is compared with that of photoelectric magnetographs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00147116
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Solar magnetic-field measurements using Babinet compensators (1969)
    Springer
    Solar physics 6 (1969), S. 480-481 
    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/BF00146482
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Surgical treatment of aspergillus spondylodiscitis (2000)
    Springer
    European spine journal 9 (2000), S. 75-79 
    Details
    ISSN: 1432-0932
    Keywords: Key words Aspergillosis ; Spondylodiscitis ; Debridement ; Spinal fusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Four cases of aspergillus spondylodiscitis were treated with operative debridement and fusion. In this rarely encountered mycotic infection of the spine in immunocompromised patients rapid destruction of the intervertebral disc and vertebral bodies can occur. In advanced cases antimycotic drug therapy is thought to be ineffective and a forcing indication for surgery exists when the destruction is progressive and spinal cord compression is imminent or manifest. Spinal instrumentation can be of help in maintaining or restoring spinal stability and maintaining spinal alignment. ¶In our four patients the aspergillus spondylodiscitis was successfully eradicated and fusion achieved. In two of three patients with a neurologic deficit, this deficit disappeared. Two patients died within 6 months after the operative treatment, due to complications related to the underlying illness. One patient was left with a subtotal paraplegia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005860050014
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Oscillator-Like Hamiltonians and Squeezing (2000)
    Springer
    International journal of theoretical physics 39 (2000), S. 1515-1527 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Generalizing a recent proposal leading to one-parameter families of Hamiltoniansand to new sets of squeezed states, we construct larger classes of physicallyadmissible Hamiltonians permitting new developments in squeezing. We alsodiscuss coherence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003684011477
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Observational studies of the solar intensity profile in the far infrared and millimeter regions (1968)
    Springer
    Solar physics 3 (1968), S. 36-46 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Observations of the intensity distribution near the solar limb at 2.43 and 22.5 μ, show the absence of limb brightening to within 1 or 2 arc sec of the limb. Observations at 1.2 mm indicate limb brightening at this wavelength. These results are compared with the Utrecht Reference Photosphere and with existing data on the solar flux in the millimeter range, and suggest that the temperature minimum is broad and extends above τ 5000 = 2 × 10−3. A sharp rise of temperature is required above τ 5000 = 10−5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154241
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    On the relation between the photospheric intensity, velocity and magnetic fields (1968)
    Springer
    Solar physics 4 (1968), S. 165-167 
    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/BF00148077
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The interpretation of velocity filtergrams (1969)
    Springer
    Solar physics 9 (1969), S. 39-50 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From simultaneous filtergrams obtained in the blue and red wings of a Fraunhofer line we analyzed the velocity and intensity field at the center of the solar disk. Results are as follows: (a) Cross correlation between velocity and intensity is 0.6. It increases somewhat when long wavelengths (〉5000 km) are eliminated. (b) An rms velocity and intensity variation of 0.45 km/sec and 3.9%. The velocity power spectrum and the turbulent velocities measured from line widths and curve of growth are consistent with a power distribution 39-01 of the form 39-02 where k is the wave number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145726
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The intensity, velocity and magnetic structure of a sunspot region (1969)
    Springer
    Solar physics 10 (1969), S. 384-403 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From an investigation of spectra in a magnetically sensitive (λ 6173, g = 2.5) and insensitive line (λ 5576, g = 0), we derived the following properties for a symmetrical sunspot: (a) The magnetic field strength varies with the distance ρ(ρ ⩽ 1) from the sunspot center like H(ρ) = H(0) (1 + ρ 2)-1 (b) The zenith angle of the magnetic field varies like 90°ρ. From this and from H(ρ) we find a height gradient of 0.5 gs/km at ρ = 0. (c) The equivalent width and the half width of λ 5576 show an increase in penumbral regions of maximum Evershed flow. Most likely this is due to a combination of inhomogeneities in the Evershed flow and ‘microturbulence’. (d) We find the magnetic field strength to be larger in the dark interfilamentary regions of the penumbra. These regions move downwards with respect to the bright filaments and probably have a more horizontal magnetic field. (e) In a weak light bridge and in extensions of bright penumbral filaments into the umbra, we find a decrease of the magnetic field strength, and a more horizontal field direction with respect to the umbral surrounding. li(f)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145526
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    Paper (German National Licenses)
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