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  • 1995-1999  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Selfadjoint Extensions of the Neumann Laplacian in Domains with Cylindrical Outlets (1997)
    Springer
    Communications in mathematical physics 185 (1997), S. 689-707 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: Let be a domain with N cylindrical outlets to infinity. The solutions of the Neumann Problem for the Poisson equation are characterized within the theory of self-adjoint extensions of the operator L. Here L is the symmetric operator associated to the problem in , on , in weighted L 2 -spaces. The results are applied to examples in the theory of continuum mechanics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050106
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Solar Wind - Inner Heliosphere (1998)
    Springer
    Space science reviews 83 (1998), S. 75-86 
    Details
    ISSN: 1572-9672
    Keywords: Solar wind ; Heliosphere ; Ulysses ; SOHO ; MHD waves ; Turbulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The solar wind in the inner heliosphere, inside ~ 5 AU, has been almost fully characterized by the addition of the high heliographic latitude Ulysses mission to the many low latitude inner heliosphere missions that preceded it. The two major omissions are the high latitude solar wind at solar maximum, which will be measured during the second Ulysses polar passages, and the solar wind near the Sun, which could be analyzed by a Solar Probe mission. Here, existing knowledge of the global solar wind in the inner heliosphere is summarized in the context of the new results from Ulysses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005069328058
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Full steady Stokes system in domains with cylindrical outlets (1999)
    Springer
    Mathematische Annalen 314 (1999), S. 729-762 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002080050314
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Solar wind corotating stream interaction regions out of the ecliptic plane: Ulysses (1995)
    Springer
    Space science reviews 72 (1995), S. 99-104 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ulysses plasma observations reveal that the forward shocks that commonly bound the leading edges of corotating interaction regions (CIRs) beyond ∼2 AU from the Sun at low heliographic latitudes nearly disappeared at a latitude of S26°. On the other hand, the reverse shocks that commonly bound the trailing edges of the CIRs were observed regularly up to S41.5°, but became weaker with increasing latitude. Only three CIR shocks have been observed poleward of S41.5°; all of these were weak reverse shocks. The above effects are a result of the forward waves propagating to lower heliographic latitudes and the reverse waves to higher latitudes with increasing heliocentric distance. These observational results are in excellent agreement with the predictions of a global model of solar wind flows that originate in a simple tilted-dipole geometry back at the Sun.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768761
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ulysses solar wind observations to 56° south (1995)
    Springer
    Space science reviews 72 (1995), S. 93-98 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the 25 months since Jupiter flyby, the Ulysses spacecraft has climbed southward to a heliolatitude of 56°. This transit has been marked by an evolution from slow, dense coronal streamer belt solar wind through two regions where the rotation of the Sun carried Ulysses back and forth between streamer belt and polar coronal hole flows, and finally into a region of essentially continuous fast, low density solar wind from the southern polar coronal hole. Throughout these large changes, the momentum flux normalized to 1 AU displays very little systematic variation. In addition, the bulk properties of the polar coronal hole solar wind are quite similar to those observed in high speed streams in the ecliptic plane at 1 AU. Coronal mass ejections and forward and reverse shocks associated with corotating interaction regions have also been observed at higher heliolatitudes, however they are seen less frequently with increasing southern heliolatitude. Ulysses has thus far collected data from 20° of nearly contiguous solar wind flows from the polar coronal hole. We examine these data for characteristic variations with heliolatitude and find that the bulk properties in general show very little systematic variation across the southern polar coronal hole so far.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768760
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  • 6
    Electronic Resource
    Electronic Resource
    Ulysses observations of latitude gradients in the heliospheric magnetic field: Radial component and variances (1995)
    Springer
    Space science reviews 72 (1995), S. 165-170 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The radial component of the magnetic field at Ulysses, over latitudes from −10° to −45° and distances from 5.3 to 3.8 AU, compares very well with corresponding measurements being made by IMP-8 in the ecliptic at 1AU. There is little, if any, evidence of a latitude gradient. Variances in the field, normalized to the square of the field magnitude, show little change with latitude in variations in the magnitude but a large increase in the transverse field variations. The latter are shown to be caused by the presence of large amplitude, long period Alfvénic fluctuations. This identification is based on the close relation between the magnetic field and velocity perturbations including the effect of anisotropy in the solar wind pressure. The waves are propagating outward from the Sun, as in the ecliptic, but variance analysis indicates that the direction of propagation is radial rather than field-aligned. A significant long-period component of ≥10 hours is present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768773
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Ulysses observations of solar wind plasma parameters in the ecliptic from 1.4 to 5.4 AU and out of the ecliptic (1995)
    Springer
    Space science reviews 72 (1995), S. 113-116 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report observations of radial and latitudinal gradients of Ulysses plasma parameters. The solar wind velocity increased rapidly with latitude from 0° to 35°, then remained approximately constant at higher latitudes. Solar wind density decreased rapidly from 0° to 35° of latitude, and also was approximately constant beyond that latitude. The mass flux similarly decreased away from the equator (but less than the density), whereas the momentum flux was relatively constant. The radial gradient of the entropy at high latitude indicated a value for the polytrope index of about 1.72 (close to adiabatic); the in-ecliptic estimates of radial gradients for temperature and entropy may be biased by temporal variation. A striking increase in the alpha particle-proton velocity difference with latitude is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768764
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic holes in the solar wind and their relation to mirror-mode structures (1995)
    Springer
    Space science reviews 72 (1995), S. 201-204 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Data obtained by the Ulysses magnetometer and solar wind analyzer have been combined to study the properties of magnetic holes in the solar wind between 1 and 5.4 AU and to 23° south latitude. Although the plasma surrounding the holes was generally stable against the mirror instability, there are indications that the holes may have been remnants of mirror mode structures created upstream of the points of observation. Those indications include: (1) For the few holes for which proton or alpha-particle pressure could be measured inside the hole, the ion thermal pressure was always greater than in the plasma adjacent to the holes. (2) The plasma surrounding many of the holes was marginally stable for the mirror mode, while the plasma environment of all the holes was significantly closer to mirror instability than was the average solar wind. (3) The plasma containing trains of closely spaced holes was closer to mirror instability than was the plasma containing isolated holes. (4) The near-hole plasma had much higher ion β (ratio of thermal to magnetic pressure) than did the average solar wind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768780
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    Paper (German National Licenses)
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