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  • 1975-1979  (3)
  • 1970-1974  (6)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Note on the solar wind heating (two fluid models) (1973)
    Springer
    Astrophysics and space science 20 (1973), S. 519-520 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642221
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the relative magnitude of streaming velocities of alpha particles and protons at 1 AU (1976)
    Springer
    Astrophysics and space science 45 (1976), S. 411-417 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The occurrence at a heliocentric distance of 1 AU of alpha particle streaming velocities larger than proton streaming velocities,v α/v p 〉1 (Ogilvie, 1975) is investigated on the basis of the theory suggesting the existence in the solar wind of an accelerating force acting preferentially on the alpha particles. Accurate solution of the three-fluid model equations for the quiet solar wind indicates that anecessary andsufficient condition for (v α/v p )1 AU〉1 is the presence of a relativelyweak accelerating forceacting in a limited region in the vicinity of 1 AU. If the force is effectiveonly at small heliocentric distances, the alpha particle streaming velocity excess vanishes at distances less than 1 AU, because of the (equalization) action of the dynamical friction force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642675
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the stability of strongly non-homogeneous self-gravitating equilibria (1972)
    Springer
    Astrophysics and space science 18 (1972), S. 207-222 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability analysis of several stronglynon-homogeneous, self-gravitating, one-dimensionalunstable equilibrium systems is carried out with the help of numerical techniques. The evolution of the ‘perturbed’ unstable equilibria is studied by following the motion of the boundary curves of ‘water bag’ configurations defining the systems. It is found that initial perturbations drive the unstable equilibrium states out of equilibrium at rates depending on the typical scale length of the perturbations λ: the instability rates increase with λ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645292
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Solution of one-fluid model equations with short range retarding magnetic forces for the quiet solar wind (1974)
    Springer
    Astrophysics and space science 27 (1974), S. 383-387 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The discrepancy of the low predicted versus the observed coronal particle densities is investigated by considering radial magnetic forces acting at the base of the corona in the one fluid model equations with anomalous thermal conductivity for the quiet solar wind. If the short range retarding magnetic force is taken to fall asr −5,r being the heliocentric distance, then in order to obtain satisfactory agreement between the predicted and observed (about 3×108 cm−3 at 1R ⊙) coronal densities, the strength of the retarding magnetic force at 1R ⊙ should be 1.2 times that of the gravitational force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643885
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The collective relaxation of two-phase-space-density collisionless one-dimensional selfgravitating systems (1971)
    Springer
    Astrophysics and space science 13 (1971), S. 425-445 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The evolution of one-dimensionaltwo-phase-space-density selfgravitating systems of stars is investigated by following the motion of the boundary curves of the systems in phase space. Aqualitative agreement with Lynden-Bell's theory predicting, for the most probably state, velocity dispersions inversely proportional to the phase space density of the component at the star formation, is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649171
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A phase-space boundary integration of the Vlasov equation for collisionless one-dimensional stellar systems (1971)
    Springer
    Astrophysics and space science 13 (1971), S. 411-424 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The evolution of one dimensional (stratified) self-gravitating systems of stars with constant phase-space density (‘water bag’ model) is investigated by following the motion of the boundary curves defining the systems. The results are compared with those obtained by sheet-model computer experiments and good agreement is found. New aspects of the evolution, revealed by the present method, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649170
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Further discussion of the electron coronal densities (1976)
    Springer
    Astrophysics and space science 40 (1976), S. 111-113 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651191
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence for two maxima of activity in the 20th solar cycle (1972)
    Springer
    Solar physics 25 (1972), S. 493-497 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Analysis of the 5303 Å coronal line intensity and of the sunspot activity during the period 1962–1970 confirms the existence of two distinct maxima of solar activity, in accordance with the previous findings of Gnevyshev for the period 1954–1960.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192346
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    On the correlation of coronal green-line intensity and solar wind velocity (1975)
    Springer
    Solar physics 41 (1975), S. 349-366 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross-correlation functions have been computed between green-line intensity (Kislovodsk) and Vela solar wind velocity January–June 1967. They are calculated separately for east and west limb observations in 5° latitude increments, and the solar wind velocites are correlated at their estimated emission times by correcting for the plasma Earth-Sun transit time using the observed velocities. The cross-correlation patterns appear to be dominated by two competing effects: a tendency of quasi-stationary green-line emission and solar wind velocity to anti-correlate; and a tendency of transient green-line emission and solar wind velocity enhancements to correlate positively. We also find evidence for simultaneous (same-day) emission brightenings over 2 to 4 limb quadrants. It is therefore recommended that, following a well-known practice in solar terrestrial studies, recurrent and transient events in both solar wind and green-line emissions should be studied separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154071
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    Paper (German National Licenses)
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