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  • 1
    Electronic Resource
    Electronic Resource
    Solar wind: The quasi-radial approximation and its limitations (1975)
    Springer
    Solar physics 40 (1975), S. 487-499 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mathematical basis for approximating the solar wind expansion as nearly radial is examined and defined, removing earlier restrictions thought to occur in the presence of a magnetic field and large variations in latitude. The equations and side conditions governing quasi-radial flow are derived and solved for a simple example to illustrate how this technique can be used for global models of the solar wind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162393
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Meridional flow in the solar wind in the presence of latitudinally dependent boundary conditions (1975)
    Springer
    Solar physics 45 (1975), S. 255-266 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of latitudinally dependent boundary conditions on the large radius values of meridional flow in the distant solar wind is examined through a double perturbation expansion of the magnetohydrodynamic equations. A general result is derived for the meridional velocity which allows arbitrary specification of radial velocity, radial magnetic field, and mass flux, as a function of colatitude at some coronal reference surface. Three specific examples are treated, including the model of Pneuman and Kopp (1971). The latter example indicates that there may be flow toward the equator at large radii, as opposed to the pure equatorial divergence of internally generated motion due to a flow which is latitudinally uniform at the reference radius. A solar cycle effect most probably averages the boundary conditions so that only the equatorial divergence from an average spherically symmetric corona is seen in comet-tail observations. This may also explain the off-and-on-again nature of the meridional gradient in the radial velocity of the solar wind as seen in radio scintillation observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152236
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Streamer Evaporation (1999)
    Springer
    Space science reviews 87 (1999), S. 323-326 
    Details
    ISSN: 1572-9672
    Keywords: corona ; streamers ; magnetohydrodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Streamer evaporation is the consequence of heating in ideal MHD models because plasma is weakly contained by the magnetic field. Heating causes inflation, opening of field lines, and release of solar wind. It was discovered in simulations and, due to the absence of loss mechanisms, the ultimate end point is the complete evaporation of the streamer. Of course streamers do not behave in this way because of losses by thermal conduction and radiation. Heating is also expected to depend on ambient conditions. We use a global MHD model with thermal conduction to examine the effect of changing the heating scale height. We also extend an analytic model of streamers developed by Pneuman (1968) to show that steady streamers are unable to contain plasma for temperatures near the cusp greater than ∼ 2 × 106 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005149929192
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    Paper (German National Licenses)
    Fulltext
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